The "Heavily Armed Cyborgs" are the ones with the giant hammers.
Playing the game on multiple playthroughs will eventually net you this trophy, however if you just want it out of the way, go to File 07, and play until the MG Excelsus fight. There are 5 hammer cyborgs before you get to that checkpoint.
After the game saves, go back to the title, select File 07 again, and simply rinse and repeat. It takes a few moments to runthrough the level (especially if you have Wig B and Custom Body Red
) and even if you did not pick off a lot of these guys during your first few playthroughs, you can easily grind them out in under 30 minutes (an hour tops).
Questions, corrections and neg vote justifications below.