Siren's Squall

This achievement can be done relatively quickly in one go.
Note that one of these quests is a world quest inside the storm version of Siren Isle and the two others will also appear as blue exclamation marks on your map when you enter the storm.

First speak with [npc=227815] on Siren Isle to enter the storm.

Once you enter, grab "Ricket's Special Delivery" on the ground next to the npc you just talked to. It's behind the Crawler Mine item. You will need this extra action button for one of the quests and it also does massive AoE damage. Try not to die or you will have to run back to grab a new one if you want it.

The quests are pretty easy and straight forward, do the blue quests first to make progress on the world quest and then kill some more mobs if you need more progress to complete it.