#6 The Undertaker- WrestleMania 21
Throughout the entirety of his WWE career, The Undertaker has pretty much done everything and has achieved numerous accomplishments, however, the standout accomplishment from The Deadman's list is definitely his previously undefeated WrestleMania streak.
Heading into WrestleMania 21, The Undertaker had already cemented his place as one of WWE's biggest legends and what better way to put his streak on the line and eventually go head-to-head against The Legend Killer, Randy Orton. Orton and Undertaker's rivalry saw two generations go toe-to-toe with each other on the biggest stage of them all.
A young Randy Orton was determined to end The Undertaker's legacy and eventually kick-start his own and at one point of the match, it did seem like the former was indeed on the verge of scoring the biggest win of his career. Undertaker looked to put away Orton with the Chokeslam, only for Orton to twist his body in mid-air and eventually catch The Phenom with the RKO as he came a split second away from scoring the biggest win of his career.