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