This can be done in the "Endor Chase" training mission. In this mission, you are driving a Speeder Bike to chase after some rebels. You do not need to kill them, just chase after them. Do not hit any objects on your way to get the "Safety Ain't The Point Of A Joyride" achievement at the end of the mission. You can see the health bar at the bottom of the screen. It must stay at 100 all the time. If it drops at all, you must restart the mission. Luckily, it only takes approximately two minutes to complete the mission.