Unlock Xbox Live Gamerscore points, by completing the following Achievements.

Achievement	How to unlock
Best Friend ( 5 points )	Played as Ron.
Boom! ( 5 points )	Played as Seamus.
Burning Bridges ( 10 points )	Completed 'A Job to Do'.
Casting from Cover ( 5 points )	Defeated an enemy wizard from cover for the first time.
Change of Plans ( 20 points )	Completed 'A Turn of Events'.
Defiant Daughter ( 5 points )	Played as Ginny.
Don't Bank on it! ( 10 points )	Completed 'Gringotts'.
Familiar Faces ( 15 points )	Completed 'Surrender'.
Future Auror ( 50 points )	Got all achievements, 100% the game!
Got It Covered! ( 5 points )	Played as Neville.
Hogwarts Burning ( 15 points )	Completed 'The Battle of Hogwarts'.
It's All Come Down to This ... ( 20 points )	Completed 'Voldemort's Last Stand'.
Lost and Found ( 15 points )	Completed 'The Lost Diadem'.
Magical McGonagall ( 5 points )	Played as McGonagall.
Motherly Love ( 20 points )	Completed 'Not My Daughter'.
Pulling Teeth ( 10 points )	Completed 'The Basilisk Fang'.
Snape Sacked ( 10 points )	Completed 'A Problem of Security'.
Stay Away from Her ( 5 points )	Played as Molly.
Streets of Hogsmeade ( 10 points )	Completed 'The Streets of Hogsmeade'.
The Bigger They Are ... ( 15 points )	Completed 'A Giant Problem'.
The Brightest Witch ( 5 points )	Played as Hermione.