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