Napoleon
You got 3 stars on all levels
20 
Tentaculous
Completed the game
20 
In a Nut Shell
You took over the duodenum
15 
Slice N' Dice
You defeated the Papa Cerebellum
15 
Eye Candy
You took over the prefrontal cortex
15 
Play it Safe
Completed a level without taking any damage
10 
The Small Escape
Escaped Dr. Phluff's acid attack
10 
Shell Out
You killed Mama Amygdala
10 
When I Say Jump
You completed all challenges
10 
Mr. Immortal
You completed all levels without dying
10 
Eye for an Eye
You killed the King of the spleen
10 
Slay Away
You swallowed 5 eyes in no time!
10 
Pickup Truck
Collected all pickups in the game
10 
Jack the Ripper
You ripped out an eye
5 
Worm Eater
You defeated the Queen of the Colon
5 
Soupe a'la Turtle
You killed a Turtlepoodle
5 
Speed Devil
You completed a time challenge
5 
Perfection
You made a perfect run
5 
Limbo
You made it through a level without collecting any pickups
5 
Artful Dodger
Completed a "No Damage" challenge
5