I myself have had a persistent issue with trying to make any progress with A few challenges in mind:
The following challenges that are buggy or do not work at all are:
- Deadeye Challenge:
- Perform a headshot with DMRs. 0/100
- Inflict damage over 75m with DMRs. 0/5,000
- Heal Teammates with the Supply Bag 0/500
These are the only few I have personally have had frustrations with and have tried to fix them in anyway I can by trying out different tactics in game, but to no fix. Hoping this gets patched soon as I really want to use the infamous PSR