1000 kills with it ,tactical knife doesn't count.
no. for prestiging you only unlock new titles/emblems extra custom classes and a new symbol.
if u have ps3 add ownupwnu69 for mw2
Nope - just another class addition, challenges and titles/emblems.
They can be found at the Call of Duty wikia. A link has been added under related links
You get the ability to unlock more titles, emblems and challenges even for guns The bad thing is you'll lose all your camos, guns and xp
Well, it depends. You only get titles and emblems if you do certain things. For example, you use stopping power a lot. Finally you get the emblem for it. You could just get a few emblems and still be a level 70. It depends on what you do.
http://callofduty.wikia.com/wiki/Callsigns
50 multi-kills with claymores, frags, rpg, and/or c4
go to http://callofduty.wikia.com/wiki/Callsigns
Yes you lose everything but titles and emblems
By getting into a tenth prestige lobby.
You could buy guns,emblems,titles, gun camo,perks Well you need them to buy the stuff you want you cant unlock it like mw2 you have to buy them