Originally Posted by robertfee
50 We are the Champions
Win an Online League or Tournament
You can legitimately beat your competition or get a few friend to create tournaments and take turns winning. Please note that if you simulate or give a win to someone in the tournament, the achievement won't unlock
Just a heads up to everyone... this isn't true. I had three people join my tournament, then through the admin menu I gave out wins to everyone, making myself the champion. I logged out and back in to the main screen of the tournament and the achievement unlocked.