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As soon as one does the tank needs to hold her on it until the group clears and someone in the group needs to slow, root, or cc her in the geyser. Once below 50% health everyone should group up on the add and wait for a geyser to spawn. Once one witch is done switch to the second witch and drop her health to 50% or less, being careful to not kill her off. In phase two follow the normal strategy of CCing one or both witches and killing the melee add first (Honor Guard), then one of the witches. The caster adds called Tempest Sea Witches are summoned in phase two have just over 200,000 health so are the best choice to try and kill for this achievement. When summoned they appear for a few seconds before sending a powerful water jet up dealing roughly 150,000 damage to everything in the geyser.
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The geysers that Lady Nazjar summons are the large blue circles that players avoid standing in (hopefully) during the fight.
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