The related link on achievements or trophies lists 51 and more can be found on other links
Unlock the challenges for them.
Your face thats the answer
get 1500 kills with each guns
You gain titles and emblems by completing certain challenges on multiplayer, check your barracks for the challanges. Here is a list of all the titles and emblems for call of duty modern warfare 2 on the Mordern warfare wiki: http://callofduty.wikia.com/wiki/Callsigns
By completing challenges or raising in rank, same for emblems
Yes you do, but not your callsigns and emblems!!! =]
yup
well call of duty and modern warfare are the same it is called Call of Duty: Modern warfare and then came call of duty: modern warfare 2
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
Call of Duty Modern Warfare came before Call of Duty Modern Warfare 2
Everrything resets except for titles and emblems. So yes.
"Call of Duty 6" "MW2" "Modern Warfare"