Finding out if you've completed a quest?

is there a command line, or even a mod that will tell you a certain quest that you have completed?

Yes, if you know the quest ID of the quest you can just do something basic like:
/run print(IsQuestFlaggedCompleted(questID))

There are quite a few mods that can tell you that a quest is completed, and even which ones you should be able to do. I am biased but I would suggest the combination of Wholly and Grail if you are interested in a lot of capabilities like seeing map pins, etc.

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And if you aren’t sure of the quest ID, you can look up the quest on Wowhead. The quest ID is in the URL bar, like this:

www.wowhead.com/quest=47254/the-originals

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This command is not working anymore?

This thread appears to have an updated macro:

https://us.forums.blizzard.com/en/wow/t/checking-quest-completion-status/745985

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Ditto. Why the heck does Blizz have such an issue with us checking if we’ve done a quest???

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New macro command is:
/script print(C_QuestLog.IsQuestFlaggedCompleted(43812))

Compliments of:

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