I finally made some time to reply to Pixelated Executioner's Shared Topic, namely my thoughts on achievements. Now, I know, this sounds odd since I already did a post that was full of achievements, but I usually don't pursue achievements for the sake of pursuing them.
I won't go for the Violet Proto-Drake for example, because it's too much of a bother. If someone were to offer me to try some achievements from Heroics while in the particular instance, then sure. But I won't actively put a group together to try and beat them (an exception is the timed run for the Bronze Drake).
I use the Northrend questing achievements as an indicator how many quests are left in a zone. Like recently I gained the Grizzly Hills questing achievement, which was the cue for me that Grizzly Hills was mostly robbed of quest money and it was time to move on to other zones. I'm trying to get the achievement, but not for the sake of the achievement.
On that note, I've hit the 3k gold mark, so 2k more to go before I can fly my Bronze Drake !
PvP achievements These are basicly an exception. When in a battleground I will try to pursue these, usually because it is the only way I can maintain my sanity in there. It gives me some extra motivation to go for the objectives instead of giving in to the general mindlessness that some battlegrounds turn into.
Raiding Achievements A bit of an annoying topic. Some achievements you just get for clearing stuff. In a way, I'd like those. As a memory that I've been there, for when my loot has long been sold to vendors and we're raiding T9. But the others ... well they're nice of course. Some of them are a nice challenge for the raid. However I think actively trying to get 'The Immortal' for example puts an unnecessary strain on the raid (and the healers in particular).
Conclusion (You didn't skip the rest and went straight to this, did you ?) I would say some achievements are worth going for if they add to my character, and they are a good way of staying busy or getting more of a challenge out of something, but some achievements are really just there 'just because' and I don't think they are worth achieving just to achieve them.
Aeltyr sneaks and attempts to pick your pockets while you're reading his diary.