Complete "Love Hurts"

Complete "Just Desserts"

Complete Year 5

Defeat Bellatrix as any Sirius Black character variant in a duel

Complete "Kreacher Discomforts"

Complete "Dumbledore's Army"

Kill 3 enemies with one hit.

Kill a poisoned level 35+ enemy with the torch in less than 30 seconds.

Complete Main Quest "The Final Weighing".

Defeat Harry (as Voldemort), in the Graveyard

Defeat Quirrell in the Quirrell boss fight, using Voldemort

Complete the game to 100%