You really messed up making this challenge. Specifically the 5th challenge where you need to either get 10 headshot kills inside objective zones in 1 life, or 20 headshot kills inside objective zones in 1 round.
It's borderline impossible. I'm decent at the game, I've had my 30 kill streaks, my 60+, 80+ kill matches, and I've also had plenty of bad matches, but I consider myself competent overall. I've completed all mastery challenges for every other gun type. Shotgun/SMG hip fire kills, bolt action headshots, LMG, MMG, Assault and Semi-auto rifles, so I fully understand the difficulty of each othese challenges, but to me it honestly seems BUGGED that you're expected to get 20 headshot objective kills with a gun that does 91 headshot damage... That's practically expecting the player to get 40 headshots, or at least aim for the head for potentially 40 shots assuming the player isn't injured already.
The main frustration with this mission is that the gun is just bad for headshots. There's no reason to aim for head. You can 2 hit kill somebody by hitting them at any point of the body, including their head, so why would you aim for head with this gun? For comparison, I don't think that headshot kills are difficult with bolt action rifles. You aim, you fire, you get a kill. Doing this with a self-loading rifle means that your opponent just either ducks or moves behind cover, runs around like a maniac meaning your chances of headshot are reduced, or somebody else on your team finishes the kill.
Having 5 shots with a 2 shot kill and a slow reload makes for such a painful experience. As I said the gun is quite good. Going 60+ kills is possible on some maps, but on these maps even if I try my hardest for headshots inside objective zones I get like 5-10 maximum, yet I need 20? Give me a break seriously. This is hair-pulling frustration. I'm borderline on the fence about quitting this game over this one single challenge... I'm not even joking. I'm too OCD to leave an assignment unfinished, so I've gotten to the point now where I just play angry, being abusive to other players who have zero empathy for my frustration, or leave the game entirely if I have a bad start. This is not how I want to play the game. It's meant to be challenging, yet fun. Not impossible and making me want to uninstall. I don't see how anybody with average or lower skill will ever complete this challenge, not in a million years. I don't even think pro players can without abusing the system. Having personal buddy revives, some guy to injure the enemy first using co-ordination making it a 1hit kill etc.
To add insult to injury. Any source of information I've found from players trying to complete this specific challenge, they all said they completed it due to a bug. Due to it just randomly completing for them, or the "one round" goal lasting for 2-3 extra rounds, meaning they needed like 7-10 headshot objective kills per game. So far I've not been so lucky. Most I've had in a single game, after trying dozens of times is 12 headshot objective kills. I don't appreciate being forced to play lame to complete this either, so I try to run and gun, same as I would in a normal game.
I dunno. This really needs adjusting. It's broken beyond belief. Bolt actions are designed for headshots, this is not. Think up some fairer assignments for a gun that sucks at headshots please... or I'm going to go insane.