The tricky thing here is that often times, you find yourself killing one dude (usually the guy you pushed) but the other one is just barely clinging to life.
So here's my theory; get yourself in a combat situation with several close combat troopers. You'll want to avoid scenarios with ranged enemies because the always seem to hit you juuuuust as you get ready to do your thing.
You've got three or four dudes around you? Great. Hit em all a few times, but make sure at least two live. Get at range, Force PULL one target to you, line up your shot, and then Force PUSH your controlled guy in front into his friend. As long as you shaved enough health off your other guy, the trophy should pop almost immediately.
Win. Dance. Repeat.