Story related, can’t miss. End of Chapter 4 after “Setting A Trap”. Quite a long set to finish. First you’ll be planting a Telephone Spy onto Dr. Linkweller’s phone in his office after luring him out with a phone call. Then you’ll snoop around the dorm rooms of Charles, Harvey, and Helena, during which you’ll use tricks “Divide and Conquer “(done right you’ll get the Divided and Conquered achievement) and “Locked Room Mystery” (requiring Cry For Help Noisemaker from Magic Shop) on two Proctors. Then to Styles lab to chat to them, then back to St. Edmund’s Hall to use the “Fruit Bowl” trick on the experiment participants. The achievement will pop as Sam speaks after selecting the Fruit Bowl trick.