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