1. Go to the Royal Rumble PPV and Simulate the event. Remember who wins as you will need to play as that person at WrestleMania.
2. Play as the Royal Rumble winner and Win the match at WrestleMania.
Example: If Undertaker wins the royal rumble(its random) then he will have a title match at WM32. It is the last match for the event. Win the match as the royal rumble winner, after the match the achievement will unlock.