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