Here is the full list of all 32 BLACKTAIL achievements.
Learn all the skill recipes
Put all the Lost and Found on the shelf
Complete the game
Poison the hedgehog
Defeat every fightable mushroom
Brew every skill of a single Hex type
Open every Warden chest
Free all the rats
Turn a blue Vodnik green
Learn all the Gnowlledge
See all the spider logs
Find the Mushroom Sanctuary
Find every Totem
Earn either the Ornithologist or the Beekeeper title
Kiss all the toads and take them to the Yard
Finish all the side quests
Be either as good or as evil as possible
Earn the Queen title
Befriend either Ant Queen or Mr. Larva
Brew every Special Treat
Discover quite a few rose secrets
Trick the bees
Earn the Favorite title
Hear a great lot of bobok gossip
Fish out a few fish
Kick a shroomy back into its lair.
Collect 32 Teeth
Hunt down a Golden Imp
Smash many Root-infested vessels
Collect 20 Teeth
Squat many times
Accept Boruta's deal