How can I download tag list with details like Sequence, forms, & emails?

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As far as I am aware you can’t, hopefully someone can say I’m wrong for you!

Not even the API has access to all that information.

If you are a developer, you can get a list of the Campaigns and their related Sequence - Paths.
But you would need to search the Path for the Tag by its name. Not what I call ideal.
https://developer.infusionsoft.com/docs/rest/#operation/listCampaignsUsingGET

Tags can be listed as well, but you will not get the additional information that you need.
https://developer.infusionsoft.com/docs/rest/#operation/listTagsUsingGET

Thanks, @Andy_Wroe @Pav for your response.