Complete "Out of Retirement"

Complete Year 5

Defeat Bellatrix as any Sirius Black character variant in a duel

Complete "Kreacher Discomforts"

Collect all the bronze, silver and gold trophies

Complete the Quidditch level within five minutes

Defeat 20 spiders with Ron

Complete the game to 100%

Buy every version of Voldemort (Quirrell/Tom Riddle/Voldemort)

Collect all of the Red Bricks

Turn the sound down to 0 and music off in the options menu whilst in the library

Buy the entire Gryffindor Quidditch team from Book One