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