And they stated that the guild achievements for legionaries will NOT be retroactive :) So all those Illidan runs were useless! (I feel more sorry for those who will have just finished their shadowmournes come Cata)

@Stalker

Um, other way around. Existing legendaries will count. That is unless you really are talking about "legionaries".

Nope, I meant legendaries, and I heard that for the 'we are legendary' guild achievement (now 'we are hardcore') specifically that the guild would be required to obtain each legendary post-cata. I wish I had the link but it was when (probably Ghostcrawler) was using that achievement as an example for the restrictions on certain guild items. He was saying that for example the dark pheonix would require not only exalted with the guild but that the guild may have a requirement through an ach, he used that ach simply as an example and added as a side note that it will not be retroactive.

It was said not too long ago that the legendary guild achievements are going to be changed so legendaries pre-cata will count.

http://forums.worldofwarcraft.com/thread.html?topicId=26560536194&pageNo=1&sid=2000

Bottom of the page to see the blue post

I stand corrected, thank you sir!