How Complete is Destiny 1

Just wanna ask here (cuz I don’t know where else)

How complete are the D1 Sections of the Ishtar Collective? Might seem like a strange question, but since I have like this need to know all about the lore, and I dont want to miss ANYTHING, I wanted to ask this to make sure that I’m not.

Sorry if this post is not really meant to be here, but I hope people can help me with this