This achievment can be obtained within the third level "
Imai Town"
After you reunite with Mugen as Yuki if you move over the rooftop to your right there will be a wagon moves to the top of the map and then returns to this spot. it takes about 2:50 minutes for it to make a full loop and must be sitting still for it to be entered upon which the achievement will pop instantly.
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Video guide starts at "00:33")