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