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.
Beat Shaderik
Find 3 secret rooms
Collect the 4 main items
Beat Zodius
Find 5 secret notes
Buy an item from the shop
Bring someone a living bat
Beat Alternib
Beat Kein
Water a tree
Break 3 vases with 1 melee hit
Find 1 secret room
Find a secret note