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