People are making this sound much tougher than it actually is...
My group has obtained these atmas and we are just 4 people (a couple dual box) and sometimes we bring an extra friend along.
Obtain multiple trigger sets for each target, that way you dont need to cover every single WS to hope to stagger.
"Durinn I think can be a kite fight with just mage jobs"
Generally, if your going for atmas i dont see why you would kite fight targets that are easy to tank (which includes all those you mentioned)
"Well for briareus you will need jobs that can do ranged damage"
You do not need any ranged dmg for briareus.
"You will not be able to hold Eve, Briareus or Pulverizer with 4-5 while still bringing enough jobs to proc the !! for atma".
Partially correct, you can beat those targets very easily with 5 people or so and also cover alot of the WSs,
just chose your jobs to ensure a safe victory and
get TP before the fight, + bring TP temp items and unload a barrage of WSs as soon as the mob is popped.
"You're not doing Briareus with 4-5 and proc'ing atma. You won't be able to cover all WSs and be effective, so unless you get lucky on the proc you wont get it"
Wrong. Its easy, you just need enough trigger sets. The fight is easy with just a few people, therefore you just need to cover a decent amount of the WSs and keep trying.
It is true however that the fights may be abit rougher without any atmas. However, if you play it smart and work your way up the chain its very easy even with only few people.
The key is making the fight stable and efficient before worrying about staggering.
First make sure your support healers have the Heavens atma from windy for the refresh. After that you can target Dozing Dorian, it shouldnt pose a threat. Its a force spawn with easy triggers, and therefore you can spam it til u get lucky on staggering for its atma. The +HP on it will help get you started on some tougher targets.
Next target Durinn, its triggers are all easy to get and the NM is a push over. Nothing special about the fight, just open with a barrage of WS from all participants. Make sure everyone there makes use of w/e WS they can (an obvious example is having whm use club for instance and mnk use staff). Once you have the MM and Heavens Atmas on your backline, you have considerable healing power which is helpful in taking on the tougher targets like EE and IP.
Next i would advise going for EE as its also quite weak and dies quick once you start fighting. Its also very easy to open on with a barrage of WS and hope for staggering.
After that you pretty much have a solid base of atmas with which to make the tougher targets like IP a cakewalk.
As for job lineup, definatly bring whm and rdm. Have the rdm sub drk, for emergancy stuns and so it can open the fight with the 2 sword WSs. After that melee wise its up to you i guess MNK WAR and SAM are all good choices, personnally id go for MNK and SAM. I know WAR brings alot of WSs, but as i said earlier prioritise making the fight smooth, then u can rince and repeat til u land on 1 of the WSs you have. I wouldnt put more than 2 melee on some targets however, use ur 5th as a support job instead. Perhasps BRD is a good choice as it will also bring dagger WSs.
Dont bother bringing a PLD tank, your melee /nin should work fine if they are skilled enough.