Here is the full list of all 17 I will eat you achievements.
You must get 19 lvl.
You must get 17 lvl.
You must get 15 lvl.
You must get 13 lvl.
You must get 11 lvl.
You must get 9 lvl.
Use the Teleport spell.
You must get 7 lvl.
Use the Clons spell.
Use the Witch spell.
You must get 5 lvl.
Become a Beast and Roar!
Use the Raven spell.
You must get 3 lvl.
Sneeze as hard as possible!
You must get 1 lvl.
Use the "Quick Run" ability!