I too have completed another tour and used the steps above and it never worked. I'm certainly not playing multiplayer anymore until I know for definate that a patch or other method works. It will be my last achievement to get the full 1000 after mopping up the final campaign story.
All that time spent online for nothing. Lol. I have even spoken to a EA advisor online and was as much use as a chocolate teapot, again more of my time wasted.
I know the above steps have worked for one of my mates but I'm not lucky enough for things like this to work for me....
I have one more option to complete the 2nd sniper class again as my game froze during this tour aswell, whether or not I can be bothered to get the remaining points I'm not sure......
He Thrust's His Fist's Against The Post But Still Insist's He See's The Ghost's