| Achievement | How to unlock
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| Agent G | Finish the full campaign with your friend!
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| Agent | Finish the campaign at any difficulty.
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| Blood Bath | Finish the campaign at ARCADE difficulty.
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| Butcher | Kill 666 enemies.
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| Catch'em All! | Collect all creature entries.
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| Chariot | Beat Chariot at the end of the first chapter.
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| Collector | Collect all items in a single campaign.
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| Dance Macabre | Nail down opponent's head with Pitter.
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| Deratization | Kill all rats in game.
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| Ender | Discover all three endings.
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| Full Armory | Collect all additional weapons available in the game.
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| Glass cleaner | Don't destroy any glass panels on chapter 2.
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| Granadier | Kill five enemies at the same time.
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| Hangedman | Beat Hangedman at the end of the second chapter.
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| Headhunter | Blow off 666 heads!
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| Hermit | Beat Hermit at the end of the third chapter.
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| Hero | Save a Scientist.
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| Invincible! | Finish the whole campaign without taking any damage.
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| Magician | Beat the Magician at the end of the fourth chapter.
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| Murderer | Kill a Scientist.
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| No ammo wasted | Finish a chapter without reloading with bullets in the chamber.
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| Normal ending | Finish the game with a final score below 62,000 and the last score digit not equal to zero.
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| Not this time! | Finish single chapter without taking any damage.
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| Partner | Finish any chapter with help of Player 2.
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| Penta-Kill! | Kill five enemies in a row.
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| Psychopath | Kill all the Scientists at any chapter.
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| Really? | Lose all credits and die.
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| Reinforcements! | Let Player 2 join the game while in a middle of a campaing.
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| Ringo | Knock up an enemy as high as possible.
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| Sadist | Devastate the opponent's body as much as possible!
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| Saviour | Save all the Scientists through the campaign.
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| Secret Room | Enter secret room on Chapter 4.
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| Swifty | Shoot down fifty enemy projectiles.
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| The House Of The Dead | Unlock all achievements of The House Of The Dead!
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| Third ending | Finish the game with a final score below 62,000 and the last score digit equal to zero.
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| Traveller | Discover all paths available in the game.
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| Triple-Kill! | Kill three enemies in a row.
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| True ending | Complete the game with a total score of over 62,000.
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| Try this! | Collect your first additional weapon.
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| Unwinged | Shoot all of the Hangedman's Devilions.
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| Who let the dogs out? | Knock back the Kenfis.
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