Here is the full list of all 18 Crab Dub achievements.
Pop 100 bubbles
Beat the game!
Unlock the final boss!
First zone completed!
Kill one Octopus
Second zone completed!
Use 10 hearts
Chop 100 ice cubes!
Destroy 10 apples
Destroy 10 missiles!
Inflate 10 kittens
Jump 10 times on jellyfish
Third zone completed!
Jump 100 times on a space donkey!
Start the game in space!
Activate the magic pill!
Start game for the Crab!
Start the game on the little duck!