| Achievement | How to unlock
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| 1000 Bullets Stockpile | Store a total of 1000 bullets of any type.
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| 1st Boss Killed | Kill the boss Big Daddy.
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| 200 Bullets Stockpile | Store a total of 200 bullets of any type.
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| 2nd Boss Killed | Kill the boss Miss Glinda.
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| 3rd Boss Killed | Kill the boss Ernest F.
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| 400 Bullets Stockpile | Store a total of 400 bullets of any type.
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| 4th Boss Killed | Kill the boss Omacalt.
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| 5th Boss Killed | Kill the boss Peanut.
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| 600 Bullets Stockpile | Store a total of 600 bullets of any type.
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| 6th Boss Killed | Kill the boss Sugar Wolf.
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| 7th Boss Killed | Kill the boss Lord D.
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| 800 Bullets Stockpile | Store a total of 800 bullets of any type.
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| Dominika Playthrough | Complete the entire game with Dominika.
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| First Kill | Get your first kill.
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| Hardcore Playthrough | Complete the entire game in Hardcore Mode with any character.
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| James Playthrough | Complete the entire game with James.
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| Lulu Playthrough | Complete the entire game with Lulu.
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| Mini Boss Skull Killed | Kill the mini-boss Skull.
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| Mini-Boss Big Skull Killed | Kill the mini-boss Big Skull.
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| Mini-Boss Fishman Killed | Kill the mini-boss Fishman.
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| Mini-Boss Garlic Killed | Kill the mini-boss Garlic.
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| Mini-Boss Ghost Killed | Kill the mini-boss Ghost.
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| No Death Game | Complete the entire game without dying.
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| No Death Stage | Complete any stage without dying.
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| Normal Playthrough | Complete the entire game in Normal Mode with any character.
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| Special Kill | Kill any boss with a special attack.
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