Easiest way to do this is to first use your Pull skill to lift enemies into the air followed up by one of the following: Concussive Shot, Lance or Incinerate.
I personally did Incinerate as I did not need to be too close to the enemy who I had Pulled. You can either pull them all the way over to you and then hit them or lift them into the air and hit them from a distance.
Do this 25 times for the trophy.