I just recently completed the gold skin challenge for the Magnum and the Assault rifle. It saids I have enough kills for both of the challenges, but the challenges still show up as not completed.
This did not occur for the sniper rifle and the shotgun. I do currently have gold skins for those.
Maybe is it because I did firefight to unlock gold for magnum and the assault rifle? I got gold for shotgun and sniper completely off of multiplayer.
Thanks.