| Achievement | How to unlock | Points
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| - Complete "The Thief's Downfall".
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| - Defeat Bellatrix with Neville (Waiter) in a duel.
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| - Unlock every character with a pet (Single Player Only)
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| - Complete "Felix Felicis".
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| - Defeat Bellatrix as any Sirius Black character variant in a duel.
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| - Complete "Magic is Might".
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| - Complete "A Giant Virtuoso".
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- Albus Percival Wulfric Brian
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| - Defeat twenty spiders with Ron.
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| - Use a Quibbler dispenser 25 times.
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| - Scare twenty students using a ghost character.
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| - Complete all the LEGO Builder tutorial levels.
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- But... I Am The Chosen One
| - Complete the game to 100% (Single Player Only)
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| - Complete "The Seven Harrys".
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| - Complete "Out of Retirement".
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| - Freeze twenty characters using Glacius.
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| - Complete the Bonus Level.
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| - Collect all of the house crests in Year 1.
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| - Collect all of the house crests in Year 2.
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| - Unlock every bad wizard (Single Player Only)
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| - Buy every version of Voldemort (Quirrell/Tom Riddle/Voldemort)
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| - Defeat the mountain troll, using Quirrell.
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| - Complete "Kreacher Discomforts".
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| - Complete "Horcrux and the Hand".
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| - Defeat twenty enemies with Fang.
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| - Unlocked on hitting 50% game completion (Single Player Only)
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| - Complete "A Veiled Threat".
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| - Complete Year Four Story Levels.
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| - Visit the Hogwarts Foyer in Year 7/8.
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- I am the Half-Blood Prince
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| - Complete Year One Story Levels.
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| - Complete "Snape's Tears".
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| - Collect one billion studs (Single Player Only)
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| - Complete all lessons (Single Player Only)
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| - Destroy fifty Devil's Snare plants.
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| - Defeat ten enemies with a Muggle character.
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| - Collect ten million studs in one level.
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| - Complete the scene where Hermione and Harry dance in the tent.
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| - Complete "Dumbledore's Army".
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| - Collect all of the Red Bricks.
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| - Complete Year Three Story Levels.
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| - Unlock every pyjama character variant (Single Player Only)
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| - Complete the Quidditch level within five minutes.
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| - Buy the entire Gryffindor Quidditch team from Book One.
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| - Turn the sound down to zero and music off in the options menu whilst in the library.
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| - Defeat Quirrell in the Quirrell boss fight, using Voldemort.
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| - Defeat Harry (as Voldemort), in the Graveyard.
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| | |
| - Complete Year Two Story Levels.
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| - Complete "In Grave Danger".
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| - Hide in a barrel as Snape.
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| - Complete "Sword and Locket".
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| - Complete the Story Levels in all four years.
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| - Get True Wizard in every level.
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| - Rescue all students in peril.
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| - Unlock all of the Order of the Phoenix character variants (Single Player Only)
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| - Complete All Story Lessons.
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| - Collect all of the Gold Bricks.
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| - Complete "Just Desserts".
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- The Tale of the Three Brothers
| - Complete "Lovegood's Lunacy".
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| - Collect all of the house crests in Year 4.
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| - Collect all of the house crests in Year 3.
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| - Complete "Back to School".
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| - Complete "The Flaw in the Plan".
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| - Knock over ten characters using a ride-able object.
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| - Unlock all of the members of Dumbledore's Army (Single Player Only)
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| - Use a Weasley box with every Weasley.
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| - Complete "A Not So Merry Christmas".
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| - Defeat every Harry freeplay variant as Lord Voldemort.
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| - Complete "Fiendfyre Frenzy".
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| - Unlock all witch characters (Single Player Only)
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| - Buy the entire Weasley family.
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| - Complete "Burning Bridges".
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| - Complete the game to 100%
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