if u have ps3 add ownupwnu69 for mw2
50 multi-kills with claymores, frags, rpg, and/or c4
http://callofduty.wikia.com/wiki/Callsigns
By getting into a tenth prestige lobby.
Yes you lose everything but titles and emblems
go to http://callofduty.wikia.com/wiki/Callsigns
1000 kills with it ,tactical knife doesn't count.
heres one with emblems and titiles http://www.se7ensins.com/forums/modern-warfare-2-discussion/156442-callsigns-and-emblems-pic-list.html and heres how to get them http://www.se7ensins.com/forums/modern-warfare-2-discussion/156444-callsigns-and-get-them.html
i have a $340 j-tag and my GT is BaTTaBOi. hit me up sometime if you want
They can be found at the Call of Duty wikia. A link has been added under related links
Theres no need to prestige unless you want the extra tittles and emblems on mw2.
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.
no. for prestiging you only unlock new titles/emblems extra custom classes and a new symbol.