Here is the full list of all 50 Harry Potter & The Deathly Hallows Pt. 2 achievements worth 1,000 gamerscore.
Got all achievements, 100% the game!
Completed the game on Expert
Completed the game on Advanced
Defeated 4 enemy wizards with a Confringo cast
Completed all challenges at Gold standard
Completed all challenges
Completed your first challenge
Defeated 1000 enemy wizards in the Main Story OR Challenges
Escaped Voldemort with minimal damage to Hogwarts
Collected 100% of all items
Found all Music Tracks
Found all characters
Successfully dispelled 100 Protego shields with Expelliarmus
Defeated 5 enemy wizards with one Impedimenta cast
Completed the game on Normal
Completed 'Voldemort's Last Stand'
Completed 'Not My Daughter'
Played as Molly
Successfully paralysed 100 enemy wizards using Petrificus Totalus
Defeated 100 enemy wizards with Expulso
Used Protego to defeat 20 enemy wizards at close range
Played as Ginny
Completed 'A Turn of Events'
Played as Ron
Completed 'Surrender'
Defeated 100 enemy wizards with Confringo
Defeated 500 enemy wizards in the Main Story OR Challenges
Defeated 10 enemy wizards from cover, without aiming
Completed 'The Battle of Hogwarts'
Apparated over 100 metres
Defeated 100 enemy wizards from cover
Completed 'The Lost Diadem'
Completed 'A Giant Problem'
Completed 'A Job to Do'
Defeated 10 enemy wizards with Protego deflections
Defeated 50 enemy wizards using more than one spell
Played as Neville
Played as Seamus
Completed 'The Basilisk Fang'
Played as Hermione
Completed 'A Problem of Security'
Used Protego against 100 spells
Played as McGonagall
Completed a level without being defeated
Completed 'The Streets of Hogsmeade'
Defeated 100 enemy wizards, in the Main Story OR Challenges
Completed 'Gringotts'
Triggered 5 explosive reactions
Defeated 10 enemy wizards before they cast a spell
Defeated an enemy wizard from cover for the first time