During Career mode you will have multiple fights where you will receive three challenges to complete during that fight. My fight was against Donald Cerrone and my challenges where to.
Not allow him to land any more than 10 kicks to the body and head.
Land 5 kicks of my own to his body and head.
Give Cerrone a submission loss.
If you didn't complete the challenges, you can restart the fight. Some fights have harder challenges and you do come across a few in career mode so you can attempt it several times.