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Return to Cinder
For the Cinderstorm achievement the tank needs to be at range. I would suggest 2 mages with Reflective Presence for this achievement (it is doable with 1, but a lot easier with 2 and impossible without Reflective Presence).

Doable with reflective presence, still doable with 2 people with reflective command. Just keep tank at range and hold off on DPS until you have your 20. The DPS check component happens at a certain threshold of HPs and you have plenty of time to reflect prior to that. People not the tank can simplify this fight by staying in the windowsills and just strafe to the left/right during the cinder storm ability.

Five Ascended, One Cup
As for Five Ascended, One Cup - fight works as follows:

1. The cup that the guy is puking in prior to the fight is the cup that you have to click on when the fight is over.
2. Cup is only clickable if you have stacks of the drunken stupor debuff. These come from the AOE on the ground or his breath or the emote "So and so is getting sloshed!"
3. 5 stacks of the debuff and you throw up and lose all stacks. (someone at Trion familiar with Puke and Rally?) So grabbing 1 stack in an AOE near the end of the fight is ideal.
4. Tricky part now - the explosion that the adds do upon boss' death gives you "A moment of clarity" and removes the debuff, making the cup unclickable if you're caught in it.

What we did was pull the boss down to about 10%, wait until he threw out an AoE. At this point the mage squirreled the add (if you destroy another one immediately spawns), we all ran through the AoE and DPSed boss down. Fight finished, we called out 3-2-1 in vent and all clicked cup at same time. Shard first achievement spam commenced. Good Luck, this is a pain in the rear one to complete.

Dodge in a Fire: Defeat Rodiafel without a player taking damage from Molten Spit.
For dodge in a fire it's the big bubble he spawns on the furthest person. To get this we just had a mage stand away from him and flicker out everytime it spawned on him.