Fight a Voldemort:
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Make every attack hit in 3-D mode and avoid his attacks.
They do a lot of damage if they hit.
Game Cutscenes:
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Collect all 99 Tri-Wizard Shields.
Movie Photo Gallery:
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Collect all 74 collector cards.
Defeating Fire Salamanders:
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Hit the Fire Salamanders with Confundus (A). After you get the
Aqua spell you can hit them with that and it will kill them
immediately.