| Achievement | How to unlock
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- Are we supposed to co-op?
| - As a ghost, kill a monster possessed by another ghost.
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| - Publish a map to Steam Workshop.
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| - Beat a level killing every monster.
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| - Beat arcade mode with 0 deaths.
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| - Complete a level with a top hat.
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| - Have 3 upgrades at a time.
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| - Kill the hero in every possible (ghost-controlled) way.
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| - Deflect an egg into the bird that dropped it.
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| - Beat arcade mode without collecting a single crystal.
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| - Kill the hero with an egg that flew a long distance in a straight line.
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- That's what I call a goomba stomp!
| - As a slime, land on hero's head.
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| - Kill the same opponent 3 times in a row.
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