Here is the full list of all 24 LUNA The Shadow Dust achievements.
Enter the tower
Reveal all four paintings
Go through doors over 20 times in the Moon Painting Room
Complete the Moon Painting Room with no mistakes
Üri met Layh
Send Layh through the tube
Experienced all food cooking combinations
Reach the exit in shadow form without dropping once
Finish listening to the whole performance
Bounce on the bed over 20 times
Master and I
Travel back to the tower
Üri reunited with Layh
Triggered stone form for both characters
Release the bee in all four seasons
Water the tree over 20 times
Select the wrong book
Travel back to the room
Complete the dark wheel jigsaw
Reach the top of the ladder without slipping once
To light a candle is to cast a shadow
Discover the hidden island
Met the new apprentice
Layh dropped over 30 times during the game