Harry Potter and the Deathly Hallows - Part 1

Through the story mode, just kill every enemy you come across. This particular trophy should be earned very close to the end of the game. I earned mine about ten minutes before the game came to a close. If you miss this trophy during one playthrough, it does carry through to additional playthroughs. Just keep defeating enemies and you will recieve all other defeat trophies as well as this one.