Homefront: The Revolution

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This trophy will be unlocked upon completion of the third and final mission of the DLC, "All or Nothing", which begins after the motorcycle portion. This mission is very short and will involve a surface fight against a couple dozen KPA soldiers. You will get a chance to change your gear and refill ammo at a storage shelf just after starting this quest, so select the assault rifle (which automatically turns into it's LMG variant) and whatever other weapon you want for your secondary. From there, simply fight through all the KPA outside until you reach the other side of the area. There you will need to kill a few more enemies before heading through the door. Follow the remaining instructions of your team to reach the final cutscene and unlock this trophy.