|Play more than 20 hours in Story or Arcade mode (primary profile only).|
This will come along as you're playing. Make sure you save whenever you're done with arcade mode. This can only be done with one save file, it will not spread across other playthroughs. There's no real need to leave your Xbox on, unless you are in a rush to get it and not planning to get all 1000 in the game. The time you spend is listed on the save file if you're wondering how far along you are.
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User Score is based on 58 user ratings.