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Quest Achievements Reset, Progress Lost
In reality I don't care. Achievements are little more than a caveat for bragging rights to things that aren't all that important in the grand scheme of life.
However it still sucks. I logged in yesterday to discover after the patch that my In-Progress achievements for completing X number of quests in Glenumbra and Alik'r were reset to 0. Any active quests in those zones were erased and require I start them at their beginning as well.
I put in a ticket and we shall see what happens. Be on the lookout for reset achievements, folks.