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