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