So this was a random thing I tried to get Dedication. I was originally going to play through the campaign on all difficulties and then play online, but when I finished it the third time I came on here and fond out people were starting to unlock it. So basically I didn't play online in this game for 4 weeks straight(I ran out of LIVE and took my time in the campaign) so then I tried to get a game online the day after I heard about it and I got it. So maybe if it's not working you can try not going into the online mode for a least 4 weeks straight. I thought this would help seeing as how it's the people that haven't played the game for a while are getting it first. Hope it helps and it's not just pure luck.