| Achievement | How to unlock
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| Arachnophilia | Maul 200 enemies to death with a sawspider.
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| Beginner Speedrunner | Complete the game in 1.5 hour on at least HARD difficulty.
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| Butcher Craftsman | Upload your level pack to the Workshop.
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| Butcher | Kill 1000 enemies.
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| Expert Speedrunner | Complete the game in 45 minutes on at least HARD difficulty.
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| F@$ You Harder | Complete the game on "Harder" difficulty.
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| F@$ You the Hardest | Complete the game on "The Hardest" difficulty.
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| F@$ You | Complete the game on "Hard" difficulty.
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| Human Slaughterhouse | Impale 50 enemies on hook by kicking them.
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| Ironworks Facility Completed | Beat Ironworks Facility.
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| Jungle Outpost Completed | Beat Jungle Outpost.
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| Old Military Base Completed | Beat Old Military Base.
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| Proficient Railgun User | Kill 10 enemies with a single railgun bullet.
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| Pump Up the Difficulty | Unlock new difficulty mode.
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| Pyromaniac | Make 200 enemies die horribly by burning alive.
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| Skull Apprentice | Find 30 skulls.
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| Skull Beginner | Find 10 skulls.
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| Skull Collector | Find 20 skulls.
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| Skull Master | Find all skulls.
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| Smoked Human | Impale 25 enemies on hook by kicking them.
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| Speedrunner | Complete the game in 1 hour on at least HARD difficulty.
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| Suicider | Die 200 times in total.
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| The Last City Completed | Beat The Last City.
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| Tried Hard | Repeat a single level 10 times.
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| Volcano Research Station Completed | Beat Volcano Research Station.
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