I found the best place to do this was in Episode VI, just before actually boarding Jaba's Pleasure Barge. You're on the smaller escort barges and there's an endless supply of baddies shooting at you from Jaba's barge.
Dodging and shooting are both the same button, so just keep hitting X to shoot and you'll automatically dodge blasts from the baddies across the way. Dodging is simple and you don't have to worry about killing all the guys because they just keep coming. It only took me a few minutes to get my quota and get the achievement.