Remove game-mode specific challenges

I’m tired of playing modes I don’t like. It makes the game awful. I’m straight up having a bad time. In previous Halos I could just play modes I like, and not play modes I don’t like. Here, challenges force my hand.

For those who inevitably say “just don’t do the challenges, hurr durr” let me remind you that Challenges are the ONLY way of progressing and unlocking things in the game, without swiping a credit card.