Sure, there'll be a lot of high-octane off-road racing in the PlayStation Portable version of Tantalus and THQ's MX vs. ATV Untamed, but that's not all there is to the game. THQ has revealed that the game will also include a PSP-exclusive Milestone system.

Milestones are incentives that allow players to unlock additional content by achieving specific goals in the game. The Milestones won't be limited to World Tour mode, with some Milestones requiring players to play through multiplayer, free ride and other gameplay modes. Progress can be tracked from the game's Profile screen.

Here's a list of some of the achievements that you can get in MX vs. ATV Untamed as well as what you should do to get that Milestone icon to pop up on your screen:

• Locations. Visited 50%, 75% and 100% of the game's locations.
• Events and objectives. Completed 33%, 66% and 100% of the events and objectives.
• Special events. Won 50%, 75% and 100% of the special events.
• Stunt points. Scored 100,000; 500,000 and 1,000,000 stunt points.
• Air time. Total air time of 1 minute, 10 minutes and 1 hour.
• Hang time. Best hang time of 3, 6 and 9 seconds.
• Hole shots. 1, 10 and 100 hole shots accomplished.
• Multiplayer wins. 1, 10 and 100 multiplayer wins.
• Distance traveled. 100, 1,000 and 10,000 total miles travelled.
• Biggest combo. Biggest single combo of 3, 10 and 30 stunts.