Here is the full list of all 19 Broll achievements.
You completed the tutorial chapter at 100%
You completed the castle chapter at 100%
You completed the Broll 64 chapter at 100%
You completed the playground chapter at 100%
You completed the industrial chapter at 100%
You completed the skyland chapter at 100%
You completed the tutorial in expert mode
You completed the playground adventure in expert mode
You completed the castle adventure in expert mode
You completed broll 64 in expert mode
You completed the industrial chapter in expert mode
You completed the skyland chapter in expert mode
You finished the Broll 64 arcade mode
You finished the industrial arcade mode
You understand how Broll works, congrats
You played a lot to Broll
Maybe it's time for you to stop playing this game
You unlocked your first cosmetic object in Broll
You found more than 10 cosmetics!