I was Being a little swear getting all my gold gold, as i unlocked the last camo for the title, a hidden title popped up call weapon mastery, its a really nice titles just for people saying its pointless getting all guns gold
that is one of the challenges " get mastery with all primary weapons "
there is one also for mastering secondary weapons
It's not hidden. I saw it in my barracks the other day & I haven't even earned it yet...
The only hidden title is the "Nuked Out" one for getting 30 kills in a FFA with no lethal scorestreaks.
Defo not hidden,i saw it yesterday.