On your way to the Old Theatre, you will pass through a house covered in twinkle lights (like Christmas lights). In this house, look for a big puzzle with a podium beside it; the podium will have a picture of a hand on it. Manipulate the power sources around you until all three lines running to the podium light up. You can then solve the puzzle and open a door to the right. Once you enter here, you will get the achievement. There's also a memento at the top of this area to pick up before you leave.