Here is the full list of all 15 Crab Cakes Rescue achievements.
Complete The Electric Set
Complete The Lava Set
Complete The Button Set
Complete The Jump Set
Complete The Sizing Set
Complete The Poison Set
Complete The Platform Set
Complete The Cool Lava Set
Earn 5,000 Coins
Earn 50 Stars
Shed Shell 500 Times
Use 50 Powerups
Beat a Level at the Largest Size
Beat a Level at the Smallest Size
Earn 3 Stars on All Level Sets