Yakuza 4

If you’re diligent in running around Kamurocho as you play through the story and when you're finishing up substories, you’ll get this naturally; never take the taxi if you don't need to.

You can check your stats at anytime in any one of your hideouts. Enter the resting room inside your hideout (the door you use to save), and select Stats to find out how much KM you’ve walked.

The trophy will unlock as soon as you've ran your 100th km; you don't need to go into the Stats to unlock it.