The following method will also get you the COMEBACK!!! achievement:
Set up a story as a superstar who has the comeback ability (Orton, Cena) against anyone of your choice. Give both you and the opponent red body damage. As soon as the match starts, press to use the comeback ability, then again to start the sequence. Hit all the correct buttons and you will get your signature and get the COMEBACK!!! achievement. Hit your signature, do a wake up taunt (), hit your finisher, then go for the pin to unlock this achievement.