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