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