Get all 99 Tri-Wizard Shields to unlock the cutscenes.
Movie photo galleryGet all 74 Collector Cards to unlock the movie photo gallery.
Defeating Fire SalamandersHit the Fire Salamanders with Confundus (A). After you get the Aqua spell you can hit them with that and it will kill them immediately.
Defeating VoldemortMake every attack hit in 3-D mode and avoid his attacks, as they do a lot of damage.