@ElliotLH the c5 one didn't take me too long. I got lucky because a Mav rolled up with it being full of people in the tunnels on exposure. I tossed 3 c5 at it destroyed it and somehow got 6 kills plus the destroy of it (I think there were people around it lol) and my c5 challenge was done.
Honestly the week 5 grind isn't the problem. It's the overall season one BP grind. I am sitting at probably like 50 to 60 hours played in season 1 and I'm only at level 75. That should be enough to complete the season one BP in my opinion. It's a 10 dollar item that you buy and deserve to be able to get all items for whether you're a casual gamer or a hardcore gamer. Call of duty I know I didn't have to even spend that long competing their season passes when I bought them which I thought was fair. And the grind has just gotten worse. I'm sitting at 14k XP for one point right now. It really kinda kills my urge to even play at all because it's like feels so slow. So I complete the challenges then stop play maybe a few more games per week after that. They really need to cap the XP needed per point. At like 7000 while changing nothing else. It should be fun to complete the BP and get the unlocks, not feel like a chore. And right now at the late stages it's a chore and forever long to get one tier complete after any challenges.