In order to obtain this achievement with as little effort as possible use one of the ghost characters (Obi Wan, Yoda, Anakin). Proceed through the level at your pace, ignore your AI teammate. Jump in the AT-ST and take out each generator as quickly as possible. As soon as it's down jump out, while still in ghost form, and jump right onto the Speeder. Don't bother slowing down, YOU CAN DIE, on the speeder and still get the achievement. As soon as you've taken out all the enemy speeders and each generator at each stop proceed to the ending, pull all the levers and hop into the AT-AT taking out the final four generators. Hop out, pull the last two levers and Boom your done, achievement unlocked.