Play as Bruce Buffer
Win the Gold belt in UFC mode with a default character to unlock Bruce Buffer.

Play as Lorenzo Fertitta
Win the Gold belt in UFC mode with a created character to unlock Lorenzo Fertitta.

Karate fighting style
Successfully complete career mode with a created Sumo fighter to unlock the Karate fighting style.

Kung-Fu style
Successfully complete career mode with a kick boxer to unlock the Kung-Fu style.

Nin-Jitsu fighting style
Successfully complete career mode with a karate fighter to unlock the Nin-Jitsu fighting style.

Silver belt
Successfully complete UFC mode with a default or created character to win the Silver belt.

Gold belt
Win the Silver belt with a character, then enter UFC mode. Select the Free Weight option, then select the character with the Silver belt. Complete UFC mode again to win the Gold belt.