Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Avenged ( 25 points )	Confront the culprit behind the Vael family's murder.
Cloak and Dagger ( 25 points )	Meet secretly with the agent of the Divine
Loyalty of the Prince ( 30 points )	Earn either a friendship or rivalry with Sebastian.
Memento ( 25 points )	Give Sebastian a family heirloom.
Retribution ( 25 points )	Dealt with the mercenaries that killed the Vael family.