I also killed a Hunter just with one shot by an explosive, you can do it in many different ways, blow up a Car with a shotgun, stun the Hunter with EMP and then put explosives below it and yeah.
Placed a propane can + boom box down and attracted 2 groups of hunters. A single shot on the explosive instantly destroyed 5 of them, and heavily damaged the 6th.
Didn’t get the achievement. 
Reading all the topics and seeing vids and pics its mostly PC having problems.Played most of the map now every nut n cranny mile 4 mile and the problems ive faced aint as severe playing PS4.
Hi. How did you end up getting the thropy?
I have tried several things that others report working, but no luck for me
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I think I shot the car so it exploded on a hunter
Explosive canisters behind fast travel site at Airport runway.
Just get em to follow you round the back, and blow up the red bottles.
Boom
Thanks for replying.
I had tried several things that should have unlocked the trophy:
1: I shot up a car next to a hunter
2: I blew up a big red cannister on a farm
3: I directly one-shoted a hunter with the rocket launcher.
None of them gave me the trophy.
But later on I joined a friend in multiplayer as a guest. I was in a solo fight with a hunter. The hunter blew himself up by shooting at a car. And voila I got the trophy.
The system for monitoring trophy progress is very wonky. 
Yup, like the Marksman trophy, have got that trophy twice on two accounts on ps4, and both times I got it by buckshot a hunter/runner really close up. Overkill trophy I got by using kpist in stead of rocket launcher to name a few.
But hey, I still enjoy it 
Wonky would be one word to describe it.
I shot the tank on the back with the Exp .50 cal with AP ammo. The hunter died and a car exploded in the process. I did NOT get the achievement.
The only reason I can come up with is the car blowing up the hunter, not my shot.
EDIT: Just did it with one rocket, no avail.
This achievement took me countless tries on my game and others. I happened to do it on my wife’s server(she doesn’t play often she never made it to the big island yet). I killed a fresh never been touch prototype hunter on the bridge with a rocket. I also had my toons explosive stage 2. Components and non component at 2 as well. This also was during the 2nd-3rd patch after game release.
I feel your guys pain cause I killed countless proto/mili hunters with one shot rockets before it finally clicked for me. Best of luck
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A grenade finally did the trick.
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That’s a cheapie! In the back of the open boot of that car is a gas canister on its side, with just the top poking out. Hit the car/canister, blows up the Hunter, every one a coconut. But I got a Hunter standing next to a car without anything in it - waited for my moment when he turned his back - hit the fuel cell, which exploded the car, which killed the newly-weaked Hunter. Did I get the trophy? I did not.
Please help. I’ve logged well over 100hrs and have killed a hunter with one shot by blowing up a tank, killed multiple hunters with a radio lure and a rocket launcher shot… I don’t have a gold sniper rifle but I do have a gold rocket launcher. Ive been trying to get this trophy since early on in the game and have tried many things but nothing is working
Destroy a hunter with a single shot. Ignore the orange prototype hunters early on. Level up you tree damage. Than go back and kill a prototype hunter with a 4/5 crown or even experimental. With either .50cal rifle ,rocket launcher or shotgun.
do all of the things on this thread , also try with a exp sniper , if you have done all of this perhaps it is a bug , i wouldnt know but am trying to help. im sure shooting a prototype hunter with a exp sniper would work great now . best of luck.
I used a magnum and a gas canister
Blew myself up in the process but it sure got the job done XD
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Is this trophy glitched? I’ve done it a few different ways now and it hasn’t popped the trophy yet… Update. Just got it. I blew up an car with a bunch of machines around it. Tried it multiple times before and nothing. I noticed a few trophies popped at the exact same time I completed the final stage of challenges. Maybe they are connected or bugged together. Keep grinding and it will pop.
I did everything. With 6 star rifle, blow up cars.Diddnt worked.Do u got a hint for me
Head to the airfield, put some rounds into the hunters there but try not to kill them.
Let them kill you, respawn at the safe house after combat has ended. Take out the PVG90 and you should be able to take one out with a single shot.
Now there is an alternative method, but it’s iffy. Much like splash damage, tracking will be your issue. Same principle as above, but after you respawn, place Explosive canisters behind the safehouse. There will be 4-5 ones large red explosive canisters already there resting.
Place your own explosive canister next to them.
Just drawn the machines there, and when there is a pack of them - shoot your canister. The chain reaction alone should register one shot fired - and the hunter kill should unlock.
Hopefully x
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