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