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