Once you leave "The Black Lantern", turn left and make your way down the street, sticking to the left side. When you get to the "Rocky Mountain Record Traders" shop, look across the street on the right side of it. You should see a green sign for "The Silver Dragon" dispensary. Go inside, you'll automatically talk to Charlotte and will have to make a decision. Once that conversation is over, head into the back room of the store. On your right, on a shelf, are the gummies you need to interact with. Approach them, hold "LT" and then the "A" button, listen to the memory play out and the achievement will pop!