Last Man Sitting 100% Achievement Guide – Best Order

Getting 100% achievements in Last Man Sitting means doing much more than simply beating the campaign. There are 45 achievements covering difficulty clears, character and weapon unlocks, unusual Power Up combinations, movement challenges, massive damage totals, co-op, and PvP.

Fortunately, there are no permanently missable achievements. Levels and challenges can be replayed, so you can finish the campaign first and clean up anything you missed afterward.

Seven achievements require another player: one is connected to co-op PvE, while six involve PvP. For everything else, Easy difficulty is generally the best choice unless the achievement specifically asks for something harder.

Here’s how to approach the 100% completion grind.

Best Order for Getting All Achievements

Don’t try to complete every strange challenge immediately.

A much smoother progression is to finish the campaign first while unlocking weapons, characters, chair abilities and Power Ups. After that, clean up the weapon-only and ability-only challenges before working on specific Power Up combinations.

Leave maximum Custom Difficulty, every-level Insane clears, and PvP until later.

You’ll have far more build options by then.

Also remember that a standard PvE run gives you six Power Up slots. This becomes important for Resourceful and Stacked.

Welcome Intern

Requirement: Beat the first level.

Simply complete the opening campaign level on any difficulty.

You’ll receive the achievement automatically after winning.

You’re Hired

Requirement: Beat the final level.

Progress through the campaign until you reach the final stage and defeat its boss.

Difficulty doesn’t matter, so use Easy if you’re only interested in unlocking the achievement.

Complete Normal Difficulty

Requirement: Beat any level on Normal.

Choose a short map you’re comfortable with, select Normal, and finish the entire run.

Complete Hard Difficulty

Requirement: Beat any level on Hard.

The requirement is identical except that you need to play on Hard.

It’s worth unlocking a few permanent upgrades and finding a weapon you’re comfortable using before attempting this.

Complete Insane Difficulty

Requirement: Beat any level on Insane.

For your first Insane victory, choose whichever level you understand best.

Mobility becomes particularly important. Keep moving and build enough area damage to control crowds while maintaining something capable of quickly dealing with elites and the boss.

Senior Intern

Requirement: Beat every level on Insane.

Now you need to take that Insane clear across every map.

It’s worth manually tracking which stages you’ve completed so you don’t end up replaying maps unnecessarily.

If you’ve completed everything but Senior Intern doesn’t trigger, restart the game and replay an Insane stage you previously completed before a major game update.

H – E Double Hockey Sticks

Requirement: Beat a level on maximum Custom Difficulty.

Open Custom Difficulty and push every difficulty slider to its maximum setting.

Then complete any level.

This is one of the challenges you should save for late-game. Having most upgrades unlocked makes a huge difference, and bringing a co-op partner can make the run considerably easier.

Untouchable

Requirement: Beat a level on Normal or higher without taking damage.

The opening level on Normal is one of the easiest places to attempt this.

Keep your distance from enemies and prioritize:

Long-range attacks
Crowd control
Defensive Power Ups
Mobility

Remember that healing doesn’t help. The moment the game registers damage, you’ve failed the achievement condition for that run.

A co-op partner can make this substantially easier by handling most enemies while you stay out of danger.

The Soldier

Requirement: Beat a level using only your weapon.

Start an easy stage on Easy and never activate your Chair Ability.

Concentrate entirely on weapon upgrades and neutral bonuses.

Be careful with anything that could create automatic damage associated with your ability, as you want all offensive output to come from your weapon.

The Magician

Requirement: Beat a level using only your ability.

This is essentially the opposite of The Soldier.

Choose a strong offensive Chair Ability and never fire your weapon.

Build around ability damage, radius, cooldown reduction and repeated activations.

Easy difficulty makes the challenge much more manageable.

Resourceful

Requirement: Beat a level without filling every Power Up slot.

You normally have six Power Up slots.

For Resourceful, use five or fewer.

Once you’ve selected five different Power Ups, continue upgrading those instead of selecting a sixth. Use rerolls when necessary to avoid accidentally filling your final slot.

Finish the level while at least one slot remains empty.

Make sure you’re running version 1.0.2 or later, as an earlier issue reportedly prevented this achievement from unlocking correctly.

Teamwork

Requirement: Complete a PvE Swarm level with another player.

Create a co-op lobby and invite a friend.

You need to win the PvE level together. Merely entering a co-op run isn’t enough.

Workplace Diversity

Requirement: Unlock every playable character.

Check the character-selection screen and inspect each locked portrait.

Complete the requirement displayed for every character until the entire roster is available.

Workplace Diversity unlocks after obtaining the final missing character.

Pimp My Ride

Requirement: Unlock every Chair Ability.

The listed Chair Abilities in the current version are:

• Chair Spin
• Slam Dunk
• Hackerman
• Grenade
• T3MU-3000

Unlock all of them to earn Pimp My Ride.

Full Armory

Requirement: Unlock every weapon.

Continue progressing and complete the conditions displayed on locked weapon cards.

Remember that the Blast & Cast update added the Blast Gun and Spellbook, so older weapon lists may no longer be sufficient for this achievement.

Employee Of The Month

Requirement: Unlock all content.

Treat this as a late-game cleanup achievement.

You’ll need to clear the remaining locked progression content, including characters, weapons and Chair Abilities.

Once the final required piece of content is unlocked, Employee Of The Month should trigger.

Office Olympics

Requirement: Travel 10,000 metres.

This is cumulative across your runs.

Simply playing through the campaign and completing the other achievements should contribute heavily toward the 10,000-metre requirement.

You probably don’t need to specifically grind this unless it’s still unfinished near the end.

Last Man Pro Skater

Requirement: Grind 1,000 metres.

Unlike Office Olympics, ordinary movement doesn’t count.

You specifically need to grind your chair along rails, edges and other compatible surfaces.

Make a habit of grinding whenever convenient while completing other levels. Your progress accumulates across runs.

Chill Guy

Requirement: Move less than 20 metres within one minute.

Start an easy level and find somewhere relatively safe during an early wave.

Remain almost completely stationary for one minute.

You can still turn your camera and attack, but avoid accelerating or moving your chair enough to exceed 20 metres.

Air Ball

Requirement: Stay airborne for at least two seconds during Slam Dunk.

Equip Slam Dunk.

Find an elevated location or arena edge and activate Slam Dunk in a way that gives you a long fall.

You need to remain airborne for at least two seconds before touching the ground.

Anything that improves height or airtime can make this easier.

One Shot, Multi-Kill

Requirement: Kill 10 enemies with one shot.

Gather at least 10 weak enemies into a tight group.

You can soften them first, but make sure they remain alive.

Then use a powerful shot capable of hitting the entire group.

Piercing weapons and large explosive attacks are particularly useful when combined with increased projectile size, area and damage.

Suck-Up

Requirement: Keep all three executives alive during Protect the Executives.

Wait for the Protect the Executives event to appear during PvE.

Stay near the three executives and immediately deal with enemies approaching them.

Area damage, summons and crowd-control effects are extremely helpful.

All three executives must still be alive when the event finishes.

Bull Market

Requirement: Shoot the bull’s balls in Devil’s Den.

Head to Devil’s Den and locate the bull statue.

Shoot the rather specifically modeled target beneath the bull.

The achievement should trigger immediately, meaning you don’t have to finish the run afterward.

Art Critic

Requirement: Destroy every statue at least once.

Destroy statues as you encounter them throughout the different arenas.

Progress is cumulative, so you don’t need to destroy every statue during one run.

If you’re missing Art Critic after finishing the campaign, revisit maps with unique decorations and thoroughly search their outer areas and corners.

Stacked

Requirement: Have six fully upgraded Power Ups simultaneously.

You need to fill all six Power Up slots and then completely upgrade each selection.

A longer Easy map gives you plenty of time.

Prioritize XP-related bonuses and rerolls so you can build your chosen six Power Ups efficiently.

Once you’ve committed to the six you want, concentrate on upgrading those instead of spreading resources elsewhere.

Stingy

Requirement: Hold 1,000 unspent Icarus Credits.

Don’t spend your Icarus Credits at the vending machine.

Continue saving until your balance reaches:

1,000 Icarus Credits

The achievement should trigger once you hit the threshold.

This pairs extremely well with Shopaholic.

Shopaholic

Requirement: Purchase every vending-machine item in one run.

Save a large amount of currency before going on your shopping spree.

Then purchase every available item from the vending machine during the same run.

Don’t finish the level until the machine is empty.

A good strategy is to first reach 1,000 credits for Stingy, then immediately spend your savings while working toward Shopaholic.

Bring Your Kids To Work Day

Requirement: Have 20 summons active simultaneously.

Build around Hackerman or T3MU-3000.

Take Power Ups that create additional:

Drones
Bots
Interns
Guards

Prioritize increased summon count and lifetime while reducing your ability cooldown.

The important word is simultaneously. You need 20 summons alive on the map at the same time, not 20 total summons throughout the run.

Bulking Season

Requirement: Reach 300 Overhealth.

Select Power Ups that provide Overhealth or increase its maximum capacity.

Try to avoid taking unnecessary damage while building your Overhealth pool.

Once it reaches 300, the achievement should trigger.

A longer Easy run gives you plenty of time to assemble the necessary setup.

Metal Fusion

Requirement: Spawn 30 Spinners simultaneously.

Create a build focused entirely around Spinners.

You want bonuses that increase:

Spinner count
Lifetime
Ability activation frequency

Remain in one area and continue activating your ability as soon as possible until you have 30 Spinners existing simultaneously.

Let It Rip

Requirement: Kill 20 enemies with one Chair Spin.

Equip Chair Spin and heavily improve its damage and radius.

Allow at least 20 weaker enemies to gather around your character.

Avoid passive damage effects that might kill them before you’re ready.

Once the crowd is large enough, activate one Chair Spin in the middle and kill at least 20 enemies.

Slaphappy

Requirement: Hit 30 enemies with one Slappy Hand attack.

Pick up Slappy Hand and improve its attack size and range.

Gather a very large group of enemies, then position yourself so one swing connects with at least 30 targets.

They don’t need to die.

You only need to hit them.

Studied The Blade

Requirement: Deal 1,000,000 damage using only the Katana.

Equip the Katana and concentrate your build around weapon damage, area and attack speed.

Avoid Chair Ability damage and other sources that could interfere with the requirement.

Continue using the Katana across runs until your registered damage reaches:

1,000,000

Rave-Bot

Requirement: Have Factory and Laser Scan equipped simultaneously.

Start with T3MU-3000, since both required Power Ups belong to this ability.

Save your rerolls.

During the run, look specifically for:

Factory
Laser Scan

Once both are equipped at the same time, Rave-Bot should unlock.

Happy New Year

Requirement: Use Confetti Cannon with an evolved Conflict Solver.

Choose the weapon branch containing Confetti Cannon.

Whenever Conflict Solver appears, take it and continue upgrading it until reaching its evolution.

Once Conflict Solver is evolved, fire the Confetti Cannon.

Don’t switch away from the required weapon before the achievement registers.

Final Stand

Requirement: Remain fully charged with Steady Shot for 20 seconds.

Use either:

Long Gun
Water Gun

Obtain the Steady Shot Power Up.

Find a relatively safe location and fully build your charge. Once you’re fully charged, remain in that state for 20 uninterrupted seconds.

One useful strategy is leaving a slow enemy alive at the end of a wave.

In co-op, your partner can simply keep enemies away while you maintain the charge.

Bullet Stream

The supplied guide cuts off at the Bullet Stream entry, so its complete requirement and instructions aren’t available in the provided text.

Rather than inventing the missing Power Up combination, check its in-game achievement description before attempting it.

The same applies to achievements 38 and 39, which are absent from the pasted portion of the guide.

Employee Training

Requirement: Play a PvP match.

You’ll need another player.

Start a PvP match and continue playing until you reach the final results screen.

You don’t need to win.

Salary Increase

Requirement: Win a PvP match.

Play against another player and win the entire match.

A private lobby with a friend is the easiest way to coordinate this.

Unfireable

Requirement: Win a PvP match without losing once.

You need to win every required round of the match without allowing your opponent to take one.

Using a short series in a private lobby makes this much easier.

Don’t leave early—remain until the final results screen confirms the match victory.

The Last Man Sitting

Requirement: Win five consecutive PvP matches.

You need:

5 PvP match wins in a row

Individual round victories don’t count as separate wins.

Losing a match resets the streak.

If you’re simply hunting achievements, coordinate with the same player in a private lobby and complete all five matches consecutively.

The Icarus Experiment

Requirement: Defeat 79 players in PvP.

This is a cumulative PvP grind.

You need to eliminate:

79 player-controlled opponents

PvE enemies and bots don’t count.

Work on this alongside Salary Increase, Unfireable and your five-match winning streak to minimize the amount of dedicated PvP grinding required later.

Imagine If I Had A Real Weapon

Requirement: Win a PvP match with Get The Boot equipped.

Choose Chair Spin and obtain the Get The Boot Power Up.

Keep Get The Boot equipped through the match and win the entire PvP session.

Don’t replace the Power Up before reaching the victory/results screen, as the game checks whether you have it equipped when you win.

Fastest Route to 100% Achievements

Your first priority should be finishing the campaign and unlocking content rather than forcing complicated builds with a limited Power Up pool.

Afterward, use Easy runs for achievements such as Stacked, Stingy, Shopaholic, Bulking Season, Metal Fusion, Let It Rip and Slaphappy. Many of these can be combined if the necessary Power Ups cooperate.

Next, move onto the difficulty achievements. Complete every stage on Insane, then tackle maximum Custom Difficulty once your permanent progression is strong.

Finally, bring in another player for Teamwork and the PvP achievements. While grinding your 79 PvP eliminations, simultaneously work toward the five-match winning streak and any remaining PvP-specific conditions.

And since the supplied source is missing the complete entries for achievements 37–39, verify those three requirements in-game rather than risking a run based on guessed conditions.