This trophy guide is for Crop Duster which requires you to kill a minimum of 10 zombies with a single shot of the KT-4.
To earn this you must first build the KT-4.
This requires you to find the 3 buildable parts scattered throughout the map.Green VialFound randomly by killing a zombie with a green mist exuding from it. Once the zombie has been killed, pick the vial up from the ground
Purple Spider SerumAfter power has been activated in Lab A (Near the blue water source) lower the cage found within the lab. Inside the cage will be a severed arm with a purple mist coming from it. At the next opportunity that a spider is chasing you, move near the cage and the spider will enter it. Run up into the lab and raise the cage up. A needle will kill the spider and a purple vial of serum will be available to collect.
PlantLocated in the very back of the bunker. Enter the farthest doors from the entrance into the area with yellow stasis tanks containing test subjects. Go down the stairs and into the door with Mule Kick. There will be an area to go under water. At the very end of this passageway will be a plant on the ground, collect it and then leave the water tunnel. (There will be two areas to surface for air at the beginning, but further down you will need to shoot at orange spores for air.) This is also the same area you find the valve piece to open the Pack-a-Punch..
You now have all the parts to build the KT-4. In the Division 9 test lab, at the very back of the bunker, near where you retrieved the plant for the KT-4, is a special buildable station specific to the KT-4. Go up to it and press
. A few seconds later and you can take the weapon from the workbench.
I found the easiest way to earn this trophy was to run zombies in circles underneath Lab B, once I knew I had 10-15 in a large group, I held down the fire button to charge up a shot, spun around and shot at the closest zombie to me. The KT-4 creates an acidic area of effect blast which kills anything that runs into it. Overall the hardest part of the trophy is building the KT-4, which becomes easier and easier the more you build it.
If it doesn't pop for you, you may not have gotten 10 like you thought you did, so just try it again. This is a powerful weapon and works very well up into the higher rounds.
Heres a video by PowerPyx showing you how to get it.