Here is the full list of all 22 Labyrinth of the Witch achievements.
Registered 75 Monsterpedia
Complete all stars in the Speedrun Dungeon
Clear the Speedrun Dungeon
Clear the Trial of the Master
Clear the Trial of the Hero
Clear the Trial of the Soldier
Complete all stars in the Labyrinth (Hardcore)
Complete all stars in the Labyrinth (Infernal)
Clear the Labyrinth (Hardcore)
Clear the Labyrinth (Infernal)
Complete all stars in the Labyrinth (Royal)
Clear the Labyrinth (Royal)
Complete all stars in the Labyrinth (Lion)
Clear the Labyrinth (Lion)
Complete all stars in the Labyrinth (Hard)
Clear the Labyrinth (Hard)
Complete all stars in the Labyrinth (Medium)
Complete all stars in the Labyrinth (Easy)
Clear the Labyrinth (Medium)
Clear the Puzzle Dungeon
Clear the Labyrinth (Easy)
Clear the Lost Forest