Here is the full list of all 30 Cavity Busters achievements worth 1,000 gamerscore.
Beat the game
Beat the game on hard mode
Get 100 kills
Crack the code
Get resurrected twice in a run
Find a secret hole
Complete a run without taking any diseases
Take every disease in a single run
Dig 30 times in a single level
Get 600 kills
Get 1000 kills
Beat the game with the Champion modifier enabled
Beat the game with the Busting modifier enabled
Beat the game as Tongue Gummy
Beat the game as Baby Gummy
Beat the game as Incisor Gummy
Beat the game as Filling Gummy
Find your first bestiary entry
Find all bestiary entries
Beat the game as Denture Gummy
Have a full tuum garden
Clear a shmup level without getting hurt or letting an enemy escape
Achieve a 100% body cleanse
Release all shard enemies from their calcified prison
Extract Jacks tooth
Beat the game with the Pure modifier enabled
Beat the game as Spider Gummy
Beat the game as Tooth Gummy
Anger Diseaple
Do and collect everything