Full list of all 49 LEGO Harry Potter: Years 5-7 achievements worth 1,000 gamerscore.
Complete "Dark Times"
Complete "Dumbledore's Army"
Complete "Kreacher Discomforts"
Complete "A Giant Virtuoso"
Complete "A Veiled Threat"
Complete Year 5
Complete "Out of Retirement"
Complete "Just Desserts"
Complete "A Not So Merry Christmas"
Complete "Love Hurts"
Complete "Felix Felicis"
Complete "Horcrux and the Hand"
Complete Year 6
Complete "The Seven Harrys"
Complete "Magic is Might"
Complete "In Grave Danger"
Complete "Sword and Locket"
Complete "Lovegood's Lunacy"
Complete Year 7
Complete "The Thief's Downfall"
Complete "Back to School"
Complete "Burning Bridges"
Complete "Fiendfyre Frenzy"
Complete "Snape's Tears"
Complete "The Flaw in the Plan"
Complete Year 8
Complete the Bonus Level
Complete the game to 100% (Single Player Only)
Visit the Hogwarts Foyer in Year 7
Unlocked on hitting 50% game completion (Single Player Only)
Use a Quibbler dispenser 25 times
Stand still with no controller input for 5 minutes
Complete all lessons (Single Player Only)
Unlock all of the members of Dumbledore's Army (Single Player Only)
Use a Weasley box with every Weasley
Complete the scene where Hermione and Harry dance in the tent
Collect 1 billion studs (Single Player Only)
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)
Use the Deluminator
Defeat Bellatrix as any Sirius Black character variant in a duel