I remember these being a thing on beta and I've seen a couple friends get the achievement for said feature. I had to skip FFR on the first couple of days (for obvious reasons) and recently went back through it all to get it all done and unlock my weekly invasion quest. Grimjaw is in front of my townhall but has no quest for me? Have I missed something important to unlock this quest or am I just an unlucky person and receiver of yet another bug?

Answers on a postcard please.