The "Dastardly" achievement is hard to achieve so I made a tutorial explaining a simple way to do it without losing honor.

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1) Wait until a woman tries to steal your horse.

2) Hogtie her with your lassoo.

3) Put her on the back of your horse.

4) Ride until you find a train line.

5) Wait until you can see a train coming.

6) Pick the woman up over your shoulder.

7) Place her on the train line.

8) Watch the achievement pop up.