Originally posted by falafel
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http://callofduty.wikia.com/wiki/Callsigns/Titles
As you progress, Tick, you can also unlock killstreaks. Your default is UAV after 3 kills, drop crate after 4, and predator missile after 5. There are other ones that are lots of fun, but you can only have 3 killstreaks at a time.
If you go to the Barracks section, you'll see different challenges. They basically have one for everything you can do, like stabbing X amount of people in the back, getting X amount of prone kills, etc.

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