Here is the full list of all 17 The Heiress of Sorcery achievements.
Refuse friends' aid
Achieved by reaching the certain point in the story
Brigitte is saved!
Kill your opponent
Resist the urge to kill
Eliminate the cause of the disease
Obtain Ending #1 at Darius' route
Obtain Ending #2 at Darius' route
Obtain Ending #1 at Alvin's route
Get rejected by Alvin
Obtain Ending #2 at Alvin's route
Obtain Ending #1 at Brigitte's route
Obtain Ending #2 at Brigitte's route
Opt for Magisterium
Opt for former life
Reach all the endings