From PhilPapers forum Philosophy, Misc:

2009-06-04
Major philosophical issues that have been conclusively solved?
Reply to Sam Coleman
Perhaps I should have been more careful in phrasing the question. It seems to me as if, in most other disciplines, for something to count as "knowledge" or "truth" (don't take these words too literally), consensus is generally a good guide. Since I can't think of any such cases in philosophy myself, my question to you is: Are there any?

As I wrote in my opening post, I am thinking of achievement in a rather strict sense. I am not taking the lack of agreement amongst philosophers to count against philosophy – I am merely comparing philosophy with disciplines whose specialists appear to agree on more things than philosophers do. 

Oh, and thank you for the Kripke example!