SEGA Superstars Tennis
45 Achievements
1,000
20-25h
Xbox 360
OutRun
Run a total of 10 kilometers / 6 miles.
20
How to unlock the OutRun achievement in SEGA Superstars Tennis - Definitive Guide
The best stages to do this on are the Sonic stages where you have to collect the rings. Alternatively you will unlock this after playing for a while.
This is pretty much an automatic achievement if you play even 1/4 of the game.
This achievement will come over time by playing through Superstars mode and on Xbox LIVE. You can check your amount of distance ran by going to the main menu, then selecting options, then selecting records, then look for "Distance Traveled." It is in meters so you need to get 10,000 meters to equal 10 kilometers, for those not familiar with metric.