Originally Posted by
rogoth
in terms of hardest to accomplish due to logistics: definately undying/immortal, i lost out on the ulduar equivalents due to somebody always failing on yogg and killing somebody, and by the time i could get a group to do it, blizz had removed them to FoS status.
in terms of hardest to accomplish due to time needed: i would have to say it is a toss up between "loot 100k gold" and finishing "what a long strange trip it has been"
most of them are just tedious time sinks, and can be done very easily with just a large time commitment.