Just some quick notes, as I've been pushing hard on these with my DK/4 shaman team.

Intense Cold is really easy even without a dispeler. PVP trinket + Free Action Potion make the chains not a problem.

Volazj's Quick Demise. I got this with a friend in the guild who BEGGED me to take him. 2 dks/3 shamans, we burned him down in 17 seconds. I just need to go back and get the last shaman his, but it's easy with bloodlust + burn.

Experienced Drake RIder you get from running occulus 3 times with each drake, you'll get at least 2 from the void achievements. Just swap up who you use on the Amber Void and it's done.

Amber Void. 3 rubies/2 emeralds or 2 rubies/3 emeralds. I found 2 rubies much easier.

Ruby Void/Emerald Void - 5 amber drakes with a proper rotation of channeling/shocking + time stops makes this pretty easy. I use a 3/2 split ont he channel/shock just to account for the GCD from time stops.

Less Rabi kept giving me trouble because I'd get stunned at the wrong time. Made me sad. Ended up respecing 1 shaman into Reverb and it wsa much easier.

Chaos Theory - I just kept everyone together, dropped 4x healing streams and aoed down the adds with Death and Decay and magma totems.

Split Personality - Stupidily easy for a 4 shaman team. Hex all 3 splits and drop magma totems in the center. Let magma do all the damage. Tstorm when needed, fire nova if they pop out. Easy.

Those are the ones I generally hear people have problems with. The ONLY one I have left is Make it Count. I got Ley-Guard in 22 minutes today running 2 emerald/2 ruby/1 amber. It just sucks that this is a once a day attempt. Assuming all goes well, I should have 4 of my guys in red protos tomorrow with the 5th to follow when i get him the last 3 he need (i.e. when a tnak friend of mine who's been pushing on these comes back).

The only two achievements you may need some help on are Shave the Love (becuase you need 2 tanks to taunt) and Watch Him Die (becuase you need a kiter - but you could do this with some well timed totems/swiftness pots).