In order to unlock this achievement, you'll have to kick out of the Rock Bottom three times in the match's ending sequence. During the final cinematic, the kick out quick time event will come up after each Rock Bottom, and you'll have to hit the right segment each time, just like you would in a normal pin attempt. Keep in mind that during this cinematic, you only get one shot to hit the segment per Rock Bottom, if you hit the segment, it'll move to the next part of the cinematic, otherwise the cinematic ends, the match is over, and you'll have to start the match over to try again. If you hit the segment after each of the three Rock Bottoms, the achievement unlocks.
I have included a video of the achievement being unlocked, if you would like to see it done in action: