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