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