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