Here is the full list of all 30 BattleBlock Theater achievements.
Free all the prisoners in the Gift Shop by unlocking or trading.
Get a letter grade in every level (except Encores) in insane co-op story mode.
Be on the winning team in one arena match of every mode.
Be on the winning team in 100 arena matches.
Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.
Collect 10 Golden Hats.
Kill your teammate 50 times.
Get a letter grade in every level (except Encores) in insane solo story mode.
Complete all the Encores in any mode.
Complete 10 user-created levels in a single Featured Story playlist.
Use each weapon successfully.
Download and host a game of user-created levels.
Get 100 kills.
Make a trade with someone.
Play with the Behemoth or someone with this achievement in an online game.
Collect all the prisoners of one head shape.
Collect all the weapons in the Gift Shop by unlocking or trading.
Successfully use every melee attack move.
Free 50 prisoners in the Gift Shop.
Get an A++ in 10 levels.
Get a letter grade in every level (except Encores) in Normal Solo Story Mode.
Get a letter grade in all eight finales in any mode.
Find a secret level.
Free a fellow prisoner.
Die enough times and we give you a prize.
Complete the first four finales in any mode.
Get yourself a cool new weapon.
Get eaten alive.
Complete an encore level in Story Mode.
Complete the story's opening sequence in any mode.