Here is the full list of all 37 Grizzland achievements.
Water a Tree
Beat Kein
Beat Alternib
Beat Zodius
Beat Shaderik
Collect the 5 main Items
Exit the Castle
Jump into a pile of straw
Purify your Soul
Beat the Arena
Bring someone a living Bat
Obtain Fish Meat
Combine a full Amulet
Survive a hit from the Spiky Cube
Listen to a hidden radio in the game
Change the colour of 100 tiles in one play session
Destroy all 4 Vases around the pillar called "The Sisters"
Water an Ill Tree
See yourself in a Mirror
Open 2 Chests
Beat Zone 1 in less than 2 minutes
Kill a Hunter with a Bow
Self-Destruct
Break 3 Vases with 1 melee hit
Break 5+ vases with one arrow
Slaughter 5 Mice in 10 seconds
Fight to win
Forgive to win
Know to win
Buy an item from the Shop
Find 1 Secret Room
Find 5 Secret Rooms
Visit all of the Secret Rooms
Find a Secret Note
Collect 50% of the Notes
Collect all of the Notes
100% of the game complete!