Achieved by playing the story. Once meeting your new friend Will, you run into an alchemist that brushes past you in the Blue Cave (Blue Area). From then Will instructs you to meet him in the library in the Monster Sanctuary (Orange Area). After talking with him you decide to explore the Sanctuary Dungeons (Lime Green Area). The dungeons are full of puzzles but are fairly easy, after finding your way through you will run into a group of alchemists. Will fights one and you fight the other. You get this achievement after beating him.