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