Here is the full list of all 13 A Pretty Odd Bunny achievements.
Get all the bacon on Extra Level #3
Get all the Bacon Coins on The Underground
Visit Piggy Island.
Get 10 Bacon Coins on The Underground
Find at least one secret room on The Underground
Get all the bacon on Extra Level #2
Get all the bacon on Extra Level #1
Get all the Bacon Coins in Bunny Town
Get the secret Bacon Coin on Level 1-25
Collect 11 Bacon Coins in Bunny Town
Survive an encounter with The Butcher
Find your first Bacon Coin
Eat your first pig.