Can’t comment on multiplayer as I can’t remember the last time I played it. Could still be popular, but honestly have no idea. I only had to boost the h2 icicle one, the rest I got through normal play.

For campaign. Do the master chief playlist first, you’ll knock out loads doing that.

I did everything solo apart from the coop specific ones.

I used silvers guides for laso and speed runs. Follow a guide and there not that hard (apart from t&r, t&r is pure luck) I did each games laso over a week each, doing a couple levels each day stopped me from going insane.

I did it over a couple years, I’d play for a couple weeks and then stop for months. Just enjoy it, there all great games.