I have the Assault Shield, Ballistic Knife and the Crossbow all Gold Camo but yet I don't have the Diamond Camo available. I see that some people say that you need the Combat Knife to be gold also, I have been using the Combat Knife but don't see any way of checking your progress as far as how many kills or what Camo's I have, any suggestions on how to obtain that info ??
In the create a class menu, you have the option of customising your Combat Knife by pressing the 'Back' button (to the left of Xbox menu button).
when you're in create-a-clas press start or back (can't remeber which) and the combat knife camo list pops up. I jumped from Nuketown to Nuketown in the Chaos playlist to do my knife challenges.