This is easier to obtain once you've reached the Power Dome. Here, you'll start getting some brute Shepherds with a forceful forward/upper punch that can dislodge enemy heads with one hit, break bodies with two. If you don't get this before leaving the Dome, don't worry about that as the next area, the Grid Clash arena, will require you to use something similar in the form of a Rook Shepherd that you can utilize to break several opposing pieces. By the time you finish the Rook's upload path, for instance, you should easily have this trophy.