Credit for the video part of this guide goes to EpicCRAZY WOLF!
First you need to be able to build the Archangels. You do that by purchasing/unlocking all car upgrades.
You can check what you still need in the archangel part of the garage (Press
, go to garage, press
). Scroll right/left to see which ones you can build, If parts are missing one or more circles under the car on the screen will be red instead of green.
The easiest way to unlock this achievement is to just get a kill with every archangel in the beginning of the races using the thunderpoon when you are going for "The Guardian"/"The Messenger" achievements.
Should you have missed one but dont know which, try this method:
If you dont want to look through the video, he goes to a location that has an enemy faction car parked in it, blows it up with a thunderpoon while in an Archangel, drives a certain distance away, changes Archangel, drives back and blows the same car up again as it has respawned. Just repeat that with the Archangels you're not sure of until you get the achievement.
Here's a map screenshot of where you need to go (same place you find the water storage part in this territory):
Also for those not checking the comments, RSDAY had this to say:
"if you are missing one car, it is probably the Jack. Even though you destroy plenty of cars with the Jack when you open the Jaws, I still had to get a Jack kill."
Good luck and have fun!