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Achievement difficulty: 1 out of 10
Time to complete the full 1,000 Gamerscore points: At least 16 hours. 6 hours of actually play but the marathon achievement (run 28 miles) takes 10+ hours more.
Tip: The marathon achievement can be done by running into a wall in any of the mini games, it just takes forever. So you can rubberband your joystick if you want .This takes hours, easily over 10.