What does it take to be a SharePoint Expert, really?
I'm sure at one point or another, you've wondered about this and probably came up with some ideas. Probably before you thought of hiring someone, or probably when you wanted to do some Knowledge-Transfer.
Looks like your thinking may be done for you, thanks to Joel Oleson.
Here's what he's got to say about it: https://blogs.msdn.com/joelo/archive/2007/07/23/depth-and-breadth-in-a-sharepoint-architect-skills.aspx
Frankly, looking at this list just gives me the creeps… all the things I don't know!