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