Of the Tyr's Guard

If you're trying to figure out how to start or progress the quests for this achievement, check your quest log for anything Tyr related.

At least these quest chains need to be completed:
The Silver Purpose
Tyr's Fall
Reforging the Tyr's Guard
Tyr's Return

Having missed most of Season 2 and not bothered much with story in season 1 Im struggling to find the quest to earn this achievment. It looks as though I need to do all the Tyr related questchain starting with [storyline=1325]. Just posting incase someone is in the same boat!
(Edited to say that after doing the silver purpose quests and doing the dungeon quest to get the ingots I was able to skip a bunch i had already done then it gave me Data Recovery)

Make sure you got this completed first [quest=75953] and all chain quest of: [storyline=5455 domain=www], before you go to Data Recovery quest. There is side story quest in Azure span. I have some quest addon in game which almost overlay those npc location so I overlooked it. Otherwise you will not see her in Valdraken. Also wowhead sometimes showing Alt compeletion of it, but i guess I done the side quest on some some oy my alts so my main did not have it.