The Endor Chase mission has you racing through a forest on a super fast speeder. Complete the mission without taking damage to unlock this achievement. It might take a couple of tries to get the hang of the controls, but once you have that down, it's pretty easy.
You don't have to worry about enemies shooting at you, so just take your time and try not to run into anything. But keep in mind, you do need to stay within a certain range of enemies to pass the mission. There's a couple of distinct paths you can take. It actually feels a little like it's on rails. The middle is probably the easiest. Commit to a path and try not to chase enemies into different paths too hard. It's probably a good idea to avoid using your boost as well.
Use the right stick to steer, and the left stick can be used to strafe for minor adjustments. Pressing up on the left stick accelerates your speeder. You do NOT have to keep the stick held up. I was doing that and it made it very difficult. Once you've accelerated to a certain speed you stay at that speed unless you die or push downwards on the stick.
I found it a little easier to do in first person so you can try that too if you're still having trouble.