| Achievement | How to unlock
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| - Be on the winning team in one arena match of every mode.
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| - Collect all the weapons in the Gift Shop by unlocking or trading.
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| - Get yourself a cool new weapon.
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| - Complete the story's opening sequence in any mode.
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| - Play with the Behemoth or someone with this achievement in an online game.
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| - Die enough times and we give you a prize.
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| - Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.
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| - Complete all the Encores in any mode.
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| - Make a trade with someone.
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| - Free all the prisoners in the Gift Shop by unlocking or trading.
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| - Get a letter grade in all eight finales in any mode.
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| - Get a letter grade in every level (except Encores) in insane co-op story mode.
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| - Get a letter grade in every level (except Encores) in insane solo story mode.
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| - Free 50 prisoners in the Gift Shop.
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| - Successfully use every melee attack move.
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| - Complete the first four finales in any mode.
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| - Collect all the prisoners of one head shape.
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| - Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
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| - Complete an encore level in Story Mode.
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| - Be on the winning team in 100 arena matches.
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| - Play and rate 10 user-created levels.
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| - Download and host a game of user-created levels.
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| - Kill your teammate 50 times.
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| - Use each weapon successfully.
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