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