Collect all of the Gold Bricks

Unlock all Animagi

Collect all of the house crests in Year 3

Hide in a barrel as Snape

Buy the entire Gryffindor Quidditch team from Book One

Collect all of the house crests in Year 1

Defeat the mountain troll, using Quirrell

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

Complete the Story Levels in all four years

Complete All Story Lessons

Complete Year Three Story Levels

Defeat 20 spiders with Ron

Knock over ten characters using a ride-able object