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