WWE SmackDown vs. RAW 2011
40 Achievements
47-57h
PS3
Win Or Lose, At Least You Tried
Play an online Royal Rumble match to its conclusion. Details for this achievement will be revealed once unlocked
2.3%
How to unlock the Win Or Lose, At Least You Tried achievement in WWE SmackDown vs. RAW 2011 - Definitive Guide
Just from reading the description of this achievement it's pretty obvious what you have to do, but I just want to confirm that you only need 2 people to start one, and if he backs out and it's just you and a bunch of AI, you can just beat all of those and the achievement will unlock.
This will be achieved at the same time as Last Man Standing. All you need to do is be in the ring when the Royal Rumble finishes so you have to come first or second.