Here is the full list of all 17 GRIS achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
A color has been brought back
Fourth stage
Fifth stage
Finish the game
Sing to the magic fowls
Third stage
Feed the forest friend
Break the stone piles
Second stage
Avoid the storm
First stage
Find all mementos
Memories from the past
Avoid eel bites