| Achievement | How to unlock
|
|---|
| Aim bot (10) | Finish a level with accuracy >= 85%
|
| Arachnophobia (10) | Kill the spider queen
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| Bugged (10) | Kill the bugs without using the flamethrower in the subway level
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| Chicken (10) | Beat the game on easy difficulty before beating it on normal or hard
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| Die already (10) | Kill the skull helicopter boss
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| Dopefish lives (10) | Find dopefish in the subway level
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| Eat that (10) | Kill 300 enemies with barrels, crates or rocks
|
| Explorer (10) | Find the secret level
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| Fisticuffs (10) | Don't let core protector boss hit you with his melee attacks even once
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| Freedom (10) | Escape the prison
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| Fresh air (10) | Don't breath gas in the gas chamber trap
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| Gravity gun expert (10) | Deactivate all 3 scorpion spawners in the canyon
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| Hardcore (10) | Beat the game on hard difficulty
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| Heartbroken (10) | Finish a level without losing any lives (hearts)
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| I'm sorry, buddy (10) | Defeat the buddy boss
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| Impresses (10) | Kill 3 enemies with a single buzzsaw 2 times in a row
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| Kill the animals (10) | Destroy all the creatures in the jars in the laboratory level
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| Not a scratch (10) | Finish a level without taking any damage at all
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| Roasted (10) | Kill at least 50 enemies with flames
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| Save the animals (10) | Don't let creatures in the jars get destroyed in the laboratory level
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| That was close (10) | Finish a level with 0 lives left and health left < 25%
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| The end (10) | Kill professor Nathan and escape the facility
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| Turn back (10) | Get into dangerous places in the subway level
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| Worm feeling (10) | Don't let acid worms hit you while you're riding a boat
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