So I was looking at these over today and does anyone thing some are just crazy now that we know the mechanics? From the bosses I have experience with:
It's a Trap: If I'm reading this correctly, this means you can *never* use a crystal (on our kill, there are 0 crystals green when he dies, and we didn't get it, but maybe I am misunderstanding). I guess given enough gear you won't need to stun, but would be extremely difficult
They Dug Too Deep : The trash to Grug takes some time and by all accounts Grug is an extremely long fight. I can't see HK gear really reducing that unless Grug's HP is nerfed badly or this timer is increased significantly.
Vengenace is Mine : With the current scaling on Rend life, I can't imagine any amount of gearing will allow the Dolin tank to live through this.
Contractual Obligation : 20 contracts means kill him in 400s. At 18.6m health, that's a raid dps of 46.5k. A "best case" situation which isn't possible in reality means this is a "patchwerk" dps of 36k (actually a bit more since best case isn't best case). Most parses of relic geared people I've seen is in the 2500 dps ballpark for rogues and warriors and a bit less for mages and clerics. This will be *very* difficult to do even in complete relics (which assuming you clear HK from week 1 forward will take 5 months).
Now, I'm all for hard achievements or those that will require some gearing (No Power is trivial these days and used to be an insane though), but unless I'm missing something on a few of these, some are just plain impossible or will require gear from the next tier of raiding. Of course, I left off many achievements for the early bosses (and ignored the later bosses since I know nothing about them and can't really judge) that are completely doable and sound very fun to work on, but it feels like a few of them just missed the mark of current raiding reality.