This is another easy achievement. You'll most likely die at least once in this game and once you do receive that fatal blow, you'll come out of a outhouse, one achievement richer. You'll be low on health however, so before you run into combat again, make sure to give yourself a chicken leg, or whatever else you have for health.
If for some reason, you just can't wait to die naturally, just run up to a group of enemies and let them kill you. Since you discover a Outhouse early on, you won't have to worry so much about what will happen to you if you haven't found a magical Outhouse/transporter.