There are 50 Trophies that can be collected.

Bronze

Covert Confidence
Defeat 100 enemy wizards from cover

Blind Luck
Defeat 10 enemy wizards from cover, without aiming

Wizard-in-Training
Complete the game on Normal

Mastering Magic
Complete the game on Advanced

Protego!
Successfully use Protego against 100 spells

Expelliarmus!
Successfully dispel 100 enemy Protego shields using Expelliarmus

Petrificus Totalus!
Successfully Body-Bind 100 enemy wizards with Petrificus Totalus

Expulso!
Successfully defeat 100 enemy wizards with Expulso

Confringo!
Successfully defeat 100 enemy wizards with Confringo

Now You See Me
Apparate over 100 metres

Strategic Spell-casting
Defeat 50 enemy wizards using more than one spell

That Showed Them …
Defeat 4 enemy wizards with a Confringo cast

Stopped in Their Tracks
Defeat 5 enemy wizards with one Impedimenta cast

A Good Start
Defeat 100 enemy wizards in the Main Story and/or Challenges

Full of Character
Find all characters

Listen Up
Find all Music Tracks

Not a Scratch
Complete any level without being defeated

Having a Blast
Trigger 5 explosive reactions

Care of the Castle
Escape Voldemort with minimal damage to Hogwarts

First Rung
Complete your first challenge

Silver

Accomplished Wizard
Complete the game on Expert

The Best Defense …
Use Protego to defeat 20 enemy wizards at close range

Back to You …
Defeat 10 enemy wizards with Protego deflections

A Good Offense
Defeat 10 enemy wizards before they cast a spell

Getting There …
Defeat 500 enemy wizards in the Main Story and/or Challenges

Complete Collection
Collect 100% of all items

Gold

Hogwarts Defender
Defeat 1000 enemy wizards in the Main Story and/or Challenges

Up to the Challenge
Complete all challenges

Shining Example
Complete all challenges at Gold standard

21 Secret

Bronze

Casting from Cover
Defeat an enemy wizard from cover for the first time

Don't Bank on it!
Complete 'Gringotts' on any difficulty

Streets of Hogsmeade
Complete 'The Streets of Hogsmeade' on any difficulty

Snape Sacked
Complete 'A Problem of Security' on any difficulty

Pulling Teeth
Complete 'The Basilisk Fang' on any difficulty

Burning Bridges
Complete 'A Job to Do' on any difficulty

The Bigger They Are …
Complete 'A Giant Problem' on any difficulty

Lost and Found
Complete 'The Lost Diadem' on any difficulty

Hogwarts Burning
Complete 'The Battle of Hogwarts' on any difficulty

Familiar Faces
Complete 'Surrender' on any difficulty

Change of Plans
Complete 'A Turn of Events' on any difficulty

Motherly Love
Complete 'Not My Daughter' on any difficulty

It's All Come Down to This …
Complete 'Voldemort's Last Stand' on any difficulty

Magical McGonagall
Play as McGonagall

Defiant Daughter
Play as Ginny

The Brightest Witch
Play as Hermione

Best Friend
Play as Ron

Stay Away from Her
Play as Molly

Boom!
Play as Seamus

Got It Covered!
Play as Neville

Platinum

Future Auror
Get all Trophies, 100% the game!

http://www.ps3trophies.com/forums/ps3-trophy-news/64363-harry-potter-deathly-hallows-part-2-trophy-list.html