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