Here is the full list of all 31 Cavity Busters achievements.
Beat the game
Beat the game on hard mode
Get 100 kills
Fight a secret boss
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 a 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
Beat the game as Spider Gummy
Beat the game as Tooth Gummy
Have a full tuum garden
Clear a shmup level without getting hurt or letting an enemy escape
Achieve a 100% body cleanse
Anger Diseaple
Release all shard enemies from their calcified prison
Extract Jacks tooth
Fill out the save profile badges
Beat the game as Shmupy Gummy