Make good quality content, have it get promoted often and you'll become an editor
Most Helpful Girl
Master and Guru is achieved by anyone with the set limit of points. So basically, they asked a lot of questions and answered a lot to get the points. Doesn't mean they have the best advice, just that they spent a long time or more time getting points.
With Editors, I'm not entirely sure how they are chosen. I know they have to write a lot of MyTakes.
These titles merely indicate that the designee has been consistently persistent. Much like simply being old is no indication one possesses wisdom, merely showing up for work doesn't make one a good worker.
I think that for masters, it's not about the quality of your answers, you can become a master just by posting a lot. I think it's getting 50,000 XP that gets you the master status, I'm not sure... I think editors are chosen, yeah, but I'm not really sure how the process goes. Maybe based on regularity and how many comments they get on their mytakes.