You only need to get to 67 average, not 63 as pointed out earlier. I made it last week as soon as I got below 67; it may have been 63 in the old system - I don't know, not been here that long. I believe you also need to have played enough ranking games, but I don't know how many that is. My stats say I have played 160 ranked rounds now, so maybe it was around 150.