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