Here is the full list of unlockable achievements for Harry Potter and the Deathly Hallows: Part 2 for the Xbox 360, with the secret achievements listed at the bottom.
A Good Offence (10) – Defeated 10 enemy wizards before they cast a spell
A Good Start (10) – Defeated 100 enemy wizards, in the Main Story OR Challenges
Accomplished Wizard (150) – Completed the game on Expert
Back to You … (10) – Defeated 10 enemy wizards with Protego deflections
Blind Luck (5) – Defeated 10 enemy wizards from cover, without aiming
Care of the Castle (20) – Escaped Voldemort with minimal damage to Hogwarts
Complete Collection (50) – Collected 100% of all items
Confringo! (10) – Defeated 100 enemy wizards with Confringo
Covert Confidence (20) – Defeated 100 enemy wizards from cover
Expelliarmus! (20) – Successfully dispelled 100 Protego shields with Expelliarmus
Expulso! (10) – Defeated 100 enemy wizards with Expulso
First Rung (10) – Completed your first challenge
Full of Character (40) – Found all characters
Getting There … (20) – Defeated 500 enemy wizards in the Main Story OR Challenges
Having a Blast (5) – Triggered 5 explosive reactions
Hogwarts Defender (20) – Defeated 1000 enemy wizards in the Main Story OR Challenges
Listen Up (40) – Found all Music Tracks
Mastering Magic (80) – Completed the game on Advanced
Not a Scratch (5) – Completed a level without being defeated
Now You See Me (10) – Apparated over 100 metres
Petrificus Totalus! (15) – Successfully paralysed 100 enemy wizards using Petrificus Totalus
Protego! (20) – Used Protego against 100 spells
Shining Example (50) – Completed all challenges at Gold standard
Stopped in Their Tracks (10) – Defeated 5 enemy wizards with one Impedimenta cast
Strategic Spell-casting (10) – Defeated 50 enemy wizards using more than one spell
That Showed Them … (10) – Defeated 4 enemy wizards with a Confringo cast
The Best Defence … (10) – Used Protego to defeat 20 enemy wizards at close range
Up to the Challenge (30) – Completed all challenges
Wizard-in-Training (40) – Completed the game on Normal
Here are the 21 secret achievements you can unlock in the game:
Best Friend (5) – Played as Ron
Boom! (5) – Played as Seamus
Burning Bridges (10) – Completed ‘A Job to Do’
Casting from Cover (5) – Defeated an enemy wizard from cover for the first time
Change of Plans (20) – Completed ‘A Turn of Events’
Defiant Daughter (5) – Played as Ginny
Don’t Bank on it! (10) – Completed ‘Gringotts’
Familiar Faces (15) – Completed ‘Surrender’
Future Auror (50) – Got all achievements, 100% the game!
Got It Covered! (5) – Played as Neville
Hogwarts Burning (15) – Completed ‘The Battle of Hogwarts’
It’s All Come Down to This … (20) – Completed ‘Voldemort’s Last Stand’
Lost and Found (15) – Completed ‘The Lost Diadem’
Magical McGonagall (5) – Played as McGonagall
Motherly Love (20) – Completed ‘Not My Daughter’
Pulling Teeth (10) – Completed ‘The Basilisk Fang’
Snape Sacked (10) – Completed ‘A Problem of Security’
Stay Away from Her (5) – Played as Molly
Streets of Hogsmeade (10) – Completed ‘The Streets of Hogsmeade’
The Bigger They Are … (15) – Completed ‘A Giant Problem’
The Brightest Witch (5) – Played as Hermione