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