Defeated your first boss.

Completed 3 missions with another player.

Completed the first mission "Amaru's rescue".

Finish a round of Last Stand

Complete the game to 100%

Defeat Harry (as Voldemort), in the Graveyard

Defeat the mountain troll, using Quirrell

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

Rescue all students in peril

Buy the entire Weasley family

Defeat 20 enemies with Fang

Defeat 10 enemies with a Muggle character