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Secrets of the First Ones
Complete the storylines listed below.
Secrets of the First Ones is a 10-point achievement earned by completing 7 storylines in Zereth Mortis, with the final storyline unlocking the Double Legendary feature.
Speak with Tal-Inara
Begin the first storyline, Call of the Primus, by speaking with Tal-Inara in Oribos at 39, 69. A cinematic will play upon completion.
Ride the Anima Wyrm
For A Hasty Voyage, mount the Anima Wyrm after the conversation and use abilities 1 and 2 to reach 100%, then when the mount changes use abilities 1 through 3 to select the correct option based on the popup information — after 5 correct choices a cinematic will start.
Find Firim in Zereth Mortis
For Strangers in a Strange Land, speak with Firim at 28, 53 in Zereth Mortis.
Pick Up the Quadrangular Object
For Long Lost Firim, pick up the 
Quadrangular Object to progress the quest.
Complete All 7 Storylines
Continue through all 7 storylines to reach the final quest, which rewards the Double Legendary unlock upon completion.
Tips
See the video guide for a full walkthrough of all 7 storylines: https://youtu.be/73vyQAKCpZQ