Here is the full list of all 13 Bunnyrama achievements.
Collect all cabage in Episode 1
Find first cabbage and bring it through the portal
Complete first level
Complete all levels in Episode 1
Complete all levels in Episode 2
Complete all levels in Episode 3
Complete all levels in Bonus Episode
Complete first Bonus level
Collect all cabage in Episode 2
Collect all cabage in Episode 3
Replay level 5 times in a row
Complete 5 levels in a row without replay
Stack 5 bunnies