Here is the full list of all 12 Heroine for Hire achievements.
Get fired in the common route.
Choose mostly kind personality choices.
Choose mostly smart personality choices.
Choose mostly brave personality choices.
Hug Veris in his time of need.
Avoid letting your mother rope Fai into dinner.
Joke with Fai about his art skill.
Get flowers from Veris.
Get Veris' "Knightly Lovers" ending.
Get Veris' "Whispers in the Knight" ending.
Get Fai's "Pyrokinetic Lovers" ending.
Get Fai's "Dying Embers" ending.