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