| Achievement | How to unlock
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| - Get an A+ on any chapter.
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| - Perform every ground kill in the game.
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| - Clear chapter ?? using only a bat and the bat mask.
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| - Kill the panthers using the panther mask.
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| - Throw a weapon at an enemy so that his weapon hits another.
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| - Collect all the puzzle pieces.
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| - Get A+ on all the chapters.
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| - Kill at least one enemy with each gun.
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| - Kill at least one enemy with each melee weapon.
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| - Destroy 500 glass panels.
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| - Hit at least one enemy with each throwing weapon.
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| - Kill three or more enemies with the same brick in one throw.
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| - Kill an enemy with a brick bounced against a wall.
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| - Kill the crapping gangster with a fireaxe.
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- Sounds of Animals Fighting
| - Wear all masks at least once.
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| - Complete chapter five barehanded.
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| - Beat the epilogue with secret ending.
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| - Kill two enemies with the same brick in one throw.
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