Challenges are a set task that will reward you with either a mark, badge or stripe. These can then be selected and use to create your own custom logo that will be use to avatar Warface for facebook.
It's really easy to use. First select the character class such as medic, sniper ... Then select mark, badge, stripe, level and click OK. There are a lot of challenge icons that we do not have yet, please comment for us to add, thanks