On my YouTube channel I've created gameplay walkthrough videos covering this game.
After your first two classes you must return to Professor Weasley. She'll have to go with another student to Hogsmeade to replace supplies you lost during the intro of the game. Once you get your wand, 2 spellcrafts, 2 potion recipes, and some seeds you'll meet back up with your student companion. After a short chat trolls will invade Hogsmeade. Locals draw the first out of the village, but when a second turns up it's up to you and your companion to save the day. With the troll taken care of the achievement should be yours. This unlocks for me at 50 minutes into the video.
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