Nameless Saint and I figured a great/fast way to boost this.
Walker Assault on Endor
From Imperial spawn facing Rebel spawn, quickly boost jump diagonal-forward-left to cross the creekbed and reach building entrance. The ATST token will be near the left corner of the door (It will respawn there for awhile if ATST goes down so camp it if you don't get it at start).
Once you have ATST, go to far right of map (a little forward of spawn) you will see a platform/bridge, with two Imperial shuttles on top. Go under the platform and wait. Rebels rarely go down that path and you cant be seen otherwise (i.e., no ion torpedos) Plus, if your assigned Imperial partner chooses to spawn near you, they will actually spawn on top of the platform so they won't inadvertently spoil your boosting. The rest of the time, just wait for your Rebel boosting-buddy to head to his far left of map and come to you to get squashed.
The rebel boosting buddy should call out when they are close, so the ATST knows to shoot any other rebel wandering off the path.
In rotation, the map before it is Tatoonie. We got it in about two rounds each as ATST. It is also a great place to boost other achievements.