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Very easy. After the episode "Might is Magic," you'll appear outside a tent. Just run in and turn on the radio. The achievement will pop immediately. There are a couple of opportunities to do this--you don't have to do it right now (but if you just want to get it out of the way, now's your time). Video guide below for any clarification needed. (Make note of the fact that the video guide mistakenly says it's after Episode 2...it's not).
This is also the time and place where you can do the "Hogwarts Has Changed" achievement.
Good luck!
