Challange Mode gear set

[xzxrothxzx]

Is it possible in any way to get the Challange Mode gear?

 

To buy it for bonuses or doing the actual challange in-game?

I know there's more than me that would like to have these sets, and I've even seen some people having them.

 

So how do they, and the rest of us, get these sets? :confused:

 

Thses are the armor sets I'm refering to http://www.db.pandawow.me?achievement=6378#.