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