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