Here is the full list of all 13 Grizzland achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Water a tree
Beat Kein
Beat Alternib
Beat Zodius
Beat Shaderik
Collect the 4 main items
Bring someone a living bat
Break 3 vases with 1 melee hit
Buy an item from the shop
Find 1 secret room
Find 3 secret rooms
Find a secret note
Find 5 secret notes