Here is the full list of all 27 Claire de Lune achievements.
Kill every spider crab
Choose every negative reaction to Arturo
Call the booster a booster
Find every collectible
Use only cubes to bypass the Spider Crabs and Acid Pools levels
Choose every dad reaction possible
Headshot every Enforcer
Die in every possible way
Finish the game with a minimum number of matter objects spawned
Reach Icarus Facility
Complete every minigame in one minute or less
Flip every flippable item in the Item Codex
Travel a far distance without touching the ground
Listen to the entirety of Clair de lune in the credits
Finish the game without dying
Reach the Infirmary
Find every item in the Item Codex
Fall to your death from a great height
Find a hard to reach spot
Reach the planet surface
Choose every positive reaction to Arturo
Finish Claire de Lune
Finish the game in a short timeframe
Call the booster a trampoline
Come very close to death without dying
Reach a very high spot
Defeat the exterior levels without using the attactor