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