To see the full list of the mini-ranks you would want to go to http://sythe.org/usercenter/ after you then go to Perks - MiniRank Directory & every rank would be there.
There are compitions that Sythe has made in order to win ranks but also you can buy/sell ranks if you wanted to. However there are other ranks that are obtained by you posting a number of times in a week (10) in that section only and you would obtain it. However if you fail to post more than (10+ times) you will lose the rank, this goes to all the sections such support to gaming etc.