If you are missing a few emblems check out the site and it shows you the title/emblem and how to get them... (this is not advertising just helping)
Titles
http://callofduty.wikia.com/wiki/Callsigns/Modern_Warfare_3_Titles
Emblems
http://callofduty.wikia.com/wiki/Callsigns/Modern_Warfare_3_Emblems
G-Shock
Titles
http://callofduty.wikia.com/wiki/Callsigns/Modern_Warfare_3_Titles
Emblems
http://callofduty.wikia.com/wiki/Callsigns/Modern_Warfare_3_Emblems
G-Shock