I was looking at
http://wow-heroes.com/ and thought that there view of character raid achievements would be a nice fit on guild websites.
On their site it shows a nice graphical interface of what that character has for achievements. You can mouse over each one and it brings up the wowhead tooltip. Clicking on one brings you to the achievement page on wowhead.
I was thinking this could fit in the main section of the site, like where the news is, just on a separate page.
Even if it wasn't an automatic thing that got the data from the armory, having the admins of the site have to go in and set the status of each one wouldn't be too bad. Maybe options like Complete, Incomplete and Ignore could work.
Anyways thanks for making a great site Chops, you sir, rock.
Attached is a screenshot, click for larger size.