The hardest title to get is droppin' crates. To get it you have to drop a care package on an enemy in the game winning killcam *if you're a noob you could boost for it in 3rd person
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http://callofduty.wikia.com/wiki/Callsigns
Complete "Think Fast Stun" challenge.All of the titles and emblems can be found here http://callofduty.wikia.com/wiki/Callsigns thx.
Terminal
Mw2 doesn't have kill confirmed.
You can Prestige in MW2 precisely 10 times.