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