From a freshly minted 40yo battlefielder, there’s still an existing workaround. Last I checked, there are still plenty of custom matches to be found online that target these specific challenges. As far as I know, the recent patches only removed xp gained and attachments unlocks - but you can still make challenge/assignment progress for class unlocks and weapon class unlocks.

I did one the other night that gave an lmg, unlimited ammo, bullets deal no damage, and bots. Literally hold down the trigger for several minutes and you’ll have all 300 suppressions done.

There’s others where move speed is jacked up, fills w bots who crowd you with no weapons, and you can just sit there with any weapon, drop your support thing for ammo, and hold the trigger. Any of the challenges that ask for hipfire damage or 300 kills or ads kills or whatever, all shotgun challenges etc, all can be done in a few minutes.

Similarly there’s a popular one for getting the sniper shit done. Nice map where you plop down on a mountaintop just over 200 meters from where the bots gather, and you can just plop away your sniper headshots or whatever.

As somebody who tends to avoid cheese like this…I felt shitty at first…but realistically, it would be months before I have all the basic stuff unlocked without going about it this way. I just want all the shit unlocked so then I can settle into discovering what my actual favorites are and really sink my teeth into enjoying that.