I really doubt this is a world first or anything, but I can't see it on This Page yet so I figured I'd post it just in-case. It's definitely a server first, although it's only 10 man so I'm not sure if it qualifies.

I put together a PUG/Alt/Casual raid and we killed Iron Council, scoring the Achievement, "I Choose You, Steelbreaker."

Screenshot: http://tdmwow.com/movies/steelbreaker_down.jpg

I've picked up the Watchers' Sigils quests on my Paladin.

EDIT: Typo