Copied from my solution in the original game:
This achievement is at the beginning of the game. Simply get through the three mandatory conversations (You can skip talking to the Violinist and Baroness. To end the conversation with the Professor quicker, mash
.) and walk to the bar in the Saloon (in the third car). Examine the butterscotch and then take them. Then examine them once more to gain the option to "Look Behind the Bar".
Once behind the bar, you'll find the notepad, scissors and drawer, but for this achievement you're not interested in those. What you are interested in is the radio, all the way to the right. Examine it, then turn it on to get the achievement.