Full list of all 84 LEGO Harry Potter Collection achievements worth 2,000 gamerscore.
Achievements they've won
Achievements they've not won
Defeat every Harry freeplay variant as Lord Voldemort
Unlock every bad wizard (Single Player Only)
Complete the game to 100% (Single Player Only)
Unlock every character with a pet (Single Player Only)
Unlock all of the members of Dumbledore's Army (Single Player Only)
Unlock ALL of the Order of the Phoenix character variants (Single Player Only)
Use a Weasley box with every Weasley
Unlock all witch characters (Single Player Only)
Unlock every pyjama character variant (Single Player Only)
Use a Quibbler dispenser 25 times
Defeat Bellatrix with Neville (Waiter) in a duel
Collect 1 billion studs (Single Player Only)
Defeat 30 Red Caps
Complete the Bonus Level
Complete "The Flaw in the Plan"
Complete Year 8
Complete "Snape's Tears"
Complete "Fiendfyre Frenzy"
Complete "Burning Bridges"
Complete "Back to School"
Complete "The Thief's Downfall"
Complete Year 7
Complete "Lovegood's Lunacy"
Complete the scene where Hermione and Harry dance in the tent
Visit the Hogwarts Foyer in Year 7/8
Complete "Sword and Locket"
Unlocked on hitting 50% game completion (Single Player Only)
Complete "In Grave Danger"
Complete "Magic is Might"
Complete all lessons (Single Player Only)
Complete "The Seven Harrys"
Use the Deluminator
Complete Year 6
Complete "Horcrux and the Hand"
Complete "Felix Felicis"
Complete "Love Hurts"
Complete "A Not So Merry Christmas"
Complete "Just Desserts"
Complete "Out of Retirement"
Complete "A Veiled Threat"
Complete Year 5
Defeat Bellatrix as any Sirius Black character variant in a duel
Complete "A Giant Virtuoso"
Complete "Kreacher Discomforts"
Complete "Dumbledore's Army"
Complete "Dark Times"
Complete the Quidditch level within five minutes
Defeat 10 enemies with a Muggle character
Defeat Harry (as Voldemort), in the Graveyard
Hide in a barrel as Snape
Scare 20 students using a ghost character
Defeat 20 spiders with Ron
Defeat Quirrell in the Quirrell boss fight, using Voldemort
Complete the game to 100%
Buy every version of Voldemort (Quirrell/Tom Riddle/Voldemort)
Buy the entire Gryffindor Quidditch team from Book One
Collect all of the Gold Bricks
Rescue all students in peril
Collect all of the house crests in Year 4
Unlock all Animagi
Collect all of the house crests in Year 3
Collect all of the house crests in Year 2
Defeat 20 enemies with Fang
Buy the entire Weasley family
Freeze 20 characters using Glacius
Collect all of the house crests in Year 1
Destroy 50 Devil's Snare plants
Defeat the mountain troll, using Quirrell
Collect all of the Red Bricks
Turn the sound down to 0 and music off in the options menu whilst in the library
Get True Wizard in every level
Complete Year Four Story Levels
Complete the Story Levels in all four years
Use the Time-Turner
Complete All Story Lessons
Complete Year Three Story Levels
Complete all the LEGO Builder tutorial levels.
Collect 10 million studs in one level
Complete Year Two Story Levels
Complete Year One Story Levels
Collect 500 ghost studs
Knock over ten characters using a ride-able object