Simply go to Medal of Honor Stats - MOH Stats and you can see all of your online stats for Medal of Honor. All you need to do is go to the top of the page where the search bar is, hit the PS3 option then type your PSN name into the search bar. (Search is case senestive). After that itll tell you your stats for your online trophies, weapons, and rankings.
Man, I wish I knew about this website when I was going for platinum. It seems easier to track. It's cool that they have the multiplayer trophies and their requirements at the bottom of the profile page.