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 the storm
Memories from the past
Sing to the magic fowls
Find all mementos
Avoid eel bites
Third stage
Break the stone piles
Second stage
First stage
Finish the game
Fifth stage
A color has been brought back
Fourth stage
Feed the forest friend