Here is the full list of all 14 Chowdertwo achievements.
Actually Read The Tutorial
Defeat Space Beav
Arrive late for the first date with Scarf Girl
Defeat the Genie
Defeat Bone Roller
Defeat Butterflyachu
Defeat Sewer Boy
Defeat Diaperchu
Beat the game
Beat the game without Clammerfree
Beat the game with 70 or more sapphires remaining
Beat the game with 90 lives or more remaining
Free Clammerfree
Survive AntiKermit