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