Here is the full list of all 12 Heirs And Graces achievements.
Unlock Kamal Romance Scene
Reach 90 Reputation before the end
Pass all the main plot skill checks
Trigger a jealousy scene
Unlock Borges Romance Scene
Unlock Eloy Romance Scene
Unlock Vincent Romance Scene
Unlock Borges sexy Scene
Unlock Eloy sexy Scene
Unlock Kamal sexy Scene
Unlock Vincent sexy Scene
Unlock the bad ending scene