You can't directly hack the titles because those stats are server-sided. And what's that about downloading them? They are in your .iwd files, you don't need to download them.
The only solution I see is too use a trainer to hack in the missions, or maybe you can set them to completed and the the MP version will see that and yhink you got it legit.
I am only anwering because no one else does. I'm not really qualified for this...