If anyone wants me to, I can give them this achievment in a private match. Just send me a message on TA (or Xbox Live) and we will work out a time to quickly give this viral to you. Just as a note: if you don't have the free DLC then you will need to download it in order to play with me.
(Edit) To ease the further pain it may cause me, after I infect you (or if you are already infected and reading the solution) post a comment saying you are infected if you are able to help others get infected. In turn if I am not available, ask a commented infecter.
(Edit Number 2) I no longer have R.U.S.E. If you wish to get the achievement, see if anyone who commented on the solution can help you out. If no one who has commented still has the game, then I will remove this solution. I apologize to anyone who missed the window of time where I had owned this game.
(Edit Number 3) If you need the achievement, it would be better to PM someone rather than just leave a comment. Most of these people probably don't check this solution very often (if at all)