Here is the full list of all 23 Radical Rabbit Stew achievements.
Play a multiplayer stage with other people
Go down the rabbit hole
Get eaten by bunnies 10 times
Disturb someone's rest
Hurl yourself into the void
Beat Lord Butter without taking damage
Die by lava
Play through the game without dying
Play through the game in under 2 hours
Play through the game in under 1 hour
Read the credits
Complete the game
Collect every blue coin
Collect every spoon
Complete World 2
Beat the angry Lord Butter
Drown
Pot 100 bunnies
Whack-explode a rabbit
Complete World 1
Beat the evil Pugs Bunny
Pot multiple rabbits with one bash
Explode a rabbit with the bumpers