LEGO Harry Potter Collection achievements

Scare 20 students using a ghost character

Defeat the mountain troll, using Quirrell

Hide in a barrel as Snape

Defeat Quirrell in the Quirrell boss fight, using Voldemort

Defeat 10 enemies with a Muggle character

Defeat Harry (as Voldemort), in the Graveyard

Freeze 20 characters using Glacius

Rescue all students in peril

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

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

Complete the game to 100%

Collect all of the Gold Bricks