You found the baby costume.
You found the miner costume.
You found the clown costume.
Completed the game.
Killed all the school children.
Cleared a level with just the throwing knives.
Cleared all levels with S rank.
Cleared a level with just the flamethrower.
Cleared all levels with B rank or better.
Unlocked all the achievements.
Cleared all levels with A rank or better.
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