The following is a list of all music tracks, challenges, and character profiles unlocked by each collectible, and their numbers correspond to those in the "Harry Potter and the Deathly Hallows: Part 2 Wiki Guide":

Gringots
Music - Wandering Part 1: Sorrow
Challenge - Challenge 1: Gringotts
Character - Ron Weasley
Character - Scabior

The Streets of Hogsmeade
Character - Death Eater
Music - Wandering Part 2: Determination
Challenge - Challenge 2: The Streets of Hogsmeade
Character - Professor Snape

A Problem of Security
Music - Wandering Part 3: Mystery
Character - Amycus Carrow
Character - Alecto Carrow
Challenge - Challenge 3: A Problem of Security

The Basilisk Fang
Character - Aberforth Dumbledore
Music - Wandering Part 4: Serenity
Character - Professor McGonagall
Challenge - Challenge 4: The Basilisk Fang

A Job to Do
Music - Wandering Part 5: Dark Magic
Character - Seamus Finnigan
Characrer - Neville Longbottom
Music - Wandering Part 6: Tension
Challenge - Challenge 5: A Job to Do

The Lost Diadem
Music - Wandering Part 7: Surrender
Character - Gregory Goyle
Character - Draco Malfoy
Challenge - Challenge 6: A Giant Problem
Challenge - Challenge 7: The Lost Diadem
Character - Blaise Zabini

The Battle of Hogwarts
Character - Fenrir Greyback
Music - Combat Part 1: Courage
Character - Bellatrix Lestrange
Music - Combat Part 2: Fear at Hogwarts
Character - Hermione Granger
Challenge - Challenge 8: The Battle of Hogwarts

A Turn of Events
Music - Combat Part 3: Battle to the Vault
Challenge - Challenge 9: Surrender
Challenge - Challenge 10: A Turn of Events
Character - Harry Potter

Not My Daughter
Challenge - Challenge 11: Not My Daughter
Character - Molly Weasley
Character - Ginny Weasley
Music - Combat Part 4: Securing the Bridge

Voldemort's Last Stand
Challenge - Challenge 12: Voldemort's Last Stand
Character - Lord Voldemort
Music - Combat Part 5: The Final Duel

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