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