There are several achievements tied to the Chronicles of Alexstrasza questline, including:
Collect 4 Library Books and survive the Primalist attack. Part 1: Starting the Quest and Navigating to the Library chronicles of alexstrasza walkthrough
: To start "Chronicles of Alexstrasza," you need to have a level 85 character and have completed the previous scenario, "The End of the Line." You can then talk to Thrall in Orgrimmar, who will give you the quest to begin the scenario. There are several achievements tied to the Chronicles