Need Assistance.

Q u o t e:
Opening up a ticket should do it -- even if you don't still have the achievements, I'm pretty sure those quests were unique and one-off.

Yep. We should be able to verify completion based off of a received achievement or completed quest. Though I should not no restoration is ever guaranteed, but we will certainly do what we can, Keladol. :)

Go ahead and submit an in-game petition and inquire.