Complete "The Flaw in the Plan"
Complete Year 8
Unlocked on hitting 50% game completion (Single Player Only)
Complete "Snape's Tears"
Complete "Fiendfyre Frenzy"
Complete "Burning Bridges"
Complete "Back to School"
Complete "The Thief's Downfall"
Complete "DOBBY!"
Complete Year 7
Complete "Lovegood's Lunacy"
Complete "Sword and Locket"
Complete "In Grave Danger"
Complete the scene where Hermione and Harry dance in the tent
Complete "Magic is Might"
Complete all lessons (Single Player Only)
Complete "The Seven Harrys"
Use the Deluminator
Complete "Horcrux and the Hand"
Complete Year 6
Complete "Felix Felicis"
Complete "Love Hurts"
Complete "A Not So Merry Christmas"
Use a Quibbler dispenser 25 times
Stand still with no controller input for 5 minutes
Complete "Just Desserts"
Complete "Out of Retirement"
Complete Year 5
Complete "A Veiled Threat"
Complete "A Giant Virtuoso"
Collect 1 billion studs (Single Player Only)
Complete "Kreacher Discomforts"
Complete "Focus!"
Complete "Dark Times"
Complete "Dumbledore's Army"
Complete the Bonus Level
Complete the game to 100% (Single Player Only)
Visit the Hogwarts Foyer in Year 7
Unlock all of the members of Dumbledore's Army (Single Player Only)
Use a Weasley box with every Weasley
Defeat every Harry freeplay variant as Lord Voldemort
Unlock ALL of the Order of the Phoenix character variants (Single Player Only)
Unlock every character with a pet (Single Player Only)
Unlock all witch characters (Single Player Only)
Unlock every pyjama character variant (Single Player Only)
Defeat Bellatrix with Neville (Waiter) in a duel
Defeat 30 Red Caps
Unlock every bad wizard (Single Player Only)
Defeat Bellatrix as any Sirius Black character variant in a duel