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There's an add-on for PC called QuestMap that shows start locations all over your map, they light up in white when you complete them, but I dunno if it works retroactively.
For major quests in a zone, you can look at your achievements or Cadwell's Silver and Gold.
For minor quests, the icons for towns and delves turn white when you've competed their quests/achievements.
Thanks. In my case, I'm playing together with my brother now and we reached Deshaan where he picked up the first quest and I didn't have it. I have no idea if that's cuz I had done it before on that toon. I will have to investigate using the above resources.
You can also use the Addon Destinations, under settings you can choose to show you the completed quests as well
Council Member of AtWritsEnd, Member of LoneWolfeHelp, Donor of GhostSeaTradingCO., Factor of EastEmpireTradingCO.,HonourGuard of ´DominionImperialGuard(DIG/PVP)
Master Crafter including Jewelry, i craft for Mats and Donation, always happy to help, if Im not in the Middle of PVP, i play since around 14 Months