Didn't get the "rebellion missions" achievement

The game doesn't let me get this achievement, it says I'm missing the "Media Blitz" achievement (completing all objectives in that mission), but the funny thing is that I have the Media Blitz achievement. So I have all the rebellion achievements except for the one that you should get when you have all those achievements, I've tried playing Media Blitz again but it won't work.

Any advice?

 

Contact Blizzard technical support :/

 

Yeah, how do I do that? I found the technical support forum: http://forums.battle.net/board.html?forumId=12014&sid=3000&pageNo=1& but I can't login. My e-mail address plus battlenet password (the one I use in the game) plus the cd-key (do I really have to type that in every time?) always gives a login error.