WWE 2K15

SuperCena is a countering machine, so do yourself a favor and set the AI sliders down to make this match slightly easier. From the main menu, scroll right to find Options and move all 6 of the first ones all the way to the left. Head back to the 2K Showcase area and this is the first match in the "Hustle, Loyalty, Disrespect" series.

You don't need to complete the objectives in order to win the match and avoiding them makes things a bit easier in some cases. For example, when the objective pops up to do a Top Rope Signature move, avoid that and Irish Whip him into the corner and do the running signature instead and then proceed to beat on him until you've built up 2 finishers (3 isn't a bad idea either). Once Cena is battered quite a bit, hit him with the first signature move, watch the cutscene and then hit him with the next and follow it with a pin and enjoy the achievement.

All you have to do is win the match on Hard difficulty or higher. You don't have to worry about any of the extra objectives if you've already done them on a lower difficulty.