Here is the full list of all 13 Theseus achievements.
Find yourself trapped in the circle
Defeat the Minotaur
Hit the Minotaur three times
Elude the Minotaur on the balconies
Burn an enemy
Disobey Ariadne
Survive the charge of the Minotaur
Survive the offspring of the Minotaur
Meet Ariadne
Read to the end of the credits after completing the game
Light all the braziers
Find all the corpses
Discover the truth