Play with the Behemoth or someone with this achievement in an online game.
Get a letter grade in all eight finales in any mode.
Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.
Complete the first four finales in any mode.
Use each weapon successfully.
Free 50 prisoners in the Gift Shop.
Collect all the weapons in the Gift Shop by unlocking or trading.
Get 100 kills.
Get an A++ in 10 levels.
Successfully use every melee attack move.
Complete the story's opening sequence in any mode.
Download and host a game of user-created levels.
Make a trade with someone.
Get yourself a cool new weapon.
Free a fellow prisoner.
Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
Get a letter grade in every level (except Encores) in insane solo story mode.
Get a letter grade in every level (except Encores) in insane co-op story mode.
Complete all the Encores in any mode.
Collect 10 Golden Hats.
Be on the winning team in 100 arena matches.
Be on the winning team in one arena match of every mode.
Collect all the prisoners of one head shape.
Free all the prisoners in the Gift Shop by unlocking or trading.
Complete an encore level in Story Mode.
Complete 10 user-created levels in a single Featured Story playlist.
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