#1. Becoming a Grand Slam Champion
Brock Lesnar may be a decorated athlete, but he's not a Grand Slam Champion.
What is a Grand Slam Champion? A Grand Slam Champion is a wrestler who has won every major championship (typically four titles) in a promotion - of their gender, anyway. In WWE, you need to win one world title (currently the WWE or Universal Championship), United States Championship, Intercontinental Championship and any variation of the Tag Team Championship.
A female WWE star said her life is in danger. Details HERE
Some of the Superstars who accomplished this milestone include Edge, Big Show. The Miz, and most recently Kofi Kingston and Rey Mysterio. The current SmackDown Women's Champion Bayley is recognized as the first-ever WWE Women's Grand Slam Champion.
The Beast Brock Lesnar is just three titles away from joining the hall of Grand Slam Champions. Although holding that title isn't a major feat, it's still a great accomplishment. A huge star such as Lesnar joining the list of legends to achieve this glory would be another great career attainment for The Beast.