I am proposing a pledge of good faith and allegiance.
I will help at least the first 10 people to message me get this.
 Because I can pass off the achievement by quitting out of a player match this takes less than 5 minuets to pass on. so as long as the game is just sitting on my hard drive I can help people out [/edit]
I will help anyone who needs this achievement, all I ask is that you put your name out here in the comments and help at least one other person who needs it. because not only are viral achievements stupid they are annoying in games that take a long time to finish and with this game even if you get in a match with someone who has it and there are other people playing legit you have to beat all of them and win the whole match.
Also don't get me started on 0 GS achievements
I'm sure anyone in the comments would be willing to help out
As for me I'm usually most available weekdays from 15:00-17:00 US Central (GMT-6). I can't really promise anything on weekends but just add me on XBL with a message with "RISK" in it and I'll see what I can do.
I can confirm that Sashamorning
is correct in saying all that is needed is for someone to create a player match and hold a private slot and invite the other person in. once the game starts the player with the achievement will pause and chose to "Concede game" The player left in the match should see the victory screen and the achievement will pop.
[Boosting Tip] If you still need to go for the other online achievements
its very beneficial to try and have at least one person in your group get the achievement beforehand because with everyone trading wins one person can pass it on to everyone else in the group after a round of wins are traded
---Game set up information---
I have not yet confirmed if it can only be the non host who gets this achievement. I do not think it is but I will try and validate that part.
anywho the person setting up the match should set the game up like this for the quickest results:
Match type: Player match
any two player map
1 private slot
somewhere there's a "random" or "manual" set up option choose the random one so that it "randomly" allocates the territories at the beginning of the match so you don't have to waste time picking out the whole map. just your capitals.
place both your capitals and have one person make at least 1 attack. then the person with "Man Up" can concede the game and it should count