Your task to get this reward is Bought all the upgrades of a Skill branch. to buy skills, you need skill points and resources Resources such as gasoline, health, comms, and food parcel units are littered all around enemy camps, named locations, and outposts. But they only give 50-250 units a piece. Therefore, it is a better source tagging convoys, stealing planes and helicopters theft.
You get skill points by finding skill points collectibles in open world, leveling up, killing bosses, and by finishing end game high level story main missions. I will be very glad if you start subscribing to the channel. This will support me in translation trophies, achievements and turning these video tutorials. If you can not get the reward, let me know in the comments. I will gladly help you. If you guide a little help, or have already earned a reward, surely leave a LIKE! I wish you luck, to gain additional rewards!.