Here is the full list of all 15 Minoria achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Abandoned your mission in favor of the witches.
Executed a total of 1000 witches and enemies.
Acquired the Frailty Incense.
Defeated Harina.
Warmed up Almu, the slug girl.
Purified Princess Poeme.
Collected all the archives.
Purified the Witch of Lust.
Purified the witch deity Parushee.
Collected a total of 20 silver coins.
Defeated Frikka, leader of the thieves.
Purified the witch deity Saora.
Defeated a major enemy without taking a hit.
Purified Sister Devoir.
Rescued Princess Amelia from a group of witches.