rootninja

I say challenges because I think it’s a challenge to complete the tasks in order to get all the titles and emblems. And they’re hidden because there’s no instructions on how to unlock all the titles and emblems! There’s also the challenges that give you points towards getting level 70, but that goes by pretty quickly just from getting kills. I think it’s probably best to focus on a few guns that get you more kills as the 100 points per kill add up quickly, and if you’re doing well, you’re more likely to win matches which in turn gives you more points and completes some challenges in itself.

I normally use the guided missile or Counter UAV with the Harrier and either the Pavelow or Chopper Gunner, but I decided to mix it up one match and selected Harrier, Emergency Airdrop, and Pavelow. The kills needed for these three are 6, 7, and 8. When I got all three in a row, I got a new title, 6fears7:

There’s so many titles and emblems, but I had no idea how to unlock them all. Almost randomly, I would get a new title or emblem or both at the end of the match. But then I found this site which tells you how to get each and every one!

http://callofduty.wikia.com/wiki/Callsigns

Just for reference, here are all the killstreaks available:
3 Kills :: UAV
4 Kills :: Care Package
4 Kills :: Counter UAV
5 Kills :: Sentry Gun
5 Kills :: Predator Missile
6 Kills :: Presicion Airstrike
7 Kills :: Harrier Strike
7 Kills :: Attack Heli
8 Kills :: Emergency Airdrop
9 Kills :: Pave Low
9 Kills :: Stealth Bomber
11 Kills :: Chopper Gunner
11 Kills :: AC-130
15 Kills :: EMP
25 Kills :: Tactical Nuke