Look for a guerrilla action with a clock as the icon. Go to the location and steal the vehicle bringing it back to the target location within the pro time. The target location will not be visible until you are in the vehicle. If you leave your vehicle for more than 10 seconds, you will fail the mission. Beat all the pro times for theses missions to unlock the achievement.
These are found in each sector of mars. There are 18 total. Check how far along you are in the statistics achievement progress menu. Also, check out this thread for hints and tips on beating the pro times.