Kill 5 Helghast soldiers with 1 grenade using the attachment on the M82-G Assault Rifle

The M82-G Assault Rifle is the standard weapon used by the ISA infantry. It is the ISA equivalent of the Helghast STA-52 Assault Rifle. The secondary fire of the M82 allows you to fire a lobbed grenade which will explode on contact.

There are a quite a few good opportunities you will come across during the course of the game to earn this trophy. One such place is the first level of the chapter Vekta Evacuates. Halfway through the level, after rendezvousing with Private Billinghurst, you will enter an enclosed room with blood splattered in its doorway and with what looks like reactors inside. Immediately, head to the right side of the room, and fire the secondary round. You will most likely take all six Helghast that come through the door.