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