Knock 25 Drones out of the sky with EMP grenades.

This trophy will more than likely come naturally because using EMP grenades to destroy drones is the best way to take care of them. EMP grenades are your non-lethal grenades and can be used by holding [ Register or Signin to view external links. ] on PS4 and [ Register or Signin to view external links. ] on PS3. Cycle through the grenades until you find the EMP grenade. Now, whenever you see the flying drones simply throw an EMP grenade up in the air towards them and it'll instantly be destroy any nearby drones. This trophy can be farmed, meaning if you restart the checkpoint your kills will carry over. If you don't have this trophy by the time you have completed all the other single player trophies, you can farm it in Mission 6: Manhunt. There are lots of drones out in the streets when you are making your way towards the sniper in the tower.

An alternative method, is in the 2nd mission, "Atlas". You will have to take a grenade training course midway through the mission. You will have to EMP a fair amount of drones with EMP grenades. You can retry this course as many times as you wish until the trophy unlocks.