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