| Achievement | How to unlock
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| - Kill 20 non-boss enemies with the shotgun.
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| - Kill any boss with the shotgun.
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| - Kill 15 non-boss enemies using the sledge hammer.
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| - Broke all the breakable doors.
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| - Kill 5 non-boss enemies with dynamite.
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| |
| - Kill a boss with the rifle.
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| - Kill 10 flying enemies using the sledge hammer.
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| - Kill 20 non-boss enemies with the rifle.
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| - Kill 10 non-boss enemies with the bone saw.
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| - Kill a boss with the nail gun.
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| - Kill 10 non-boss enemies with the flame thrower.
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| - Kill 12 non-boss enemies with the nail gun.
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| - Kill 25 non-boss enemies with the pistol.
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| - Complete Chapter 1 using only the shank.
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| - Kill a boss with the pistol.
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| - Kill any Boss with the sledge hammer.
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| - Kill 50 non-boss enemies with the shank.
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