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