I just had a thought
Why does Destiny bother to Announce that someone Attunes an artifact?
And notice, that the fire in front of the corresponding statue ignites in the process.
Could there be a secret to unlock, if in a single lobby, all the artifacts are Attuned at once?
I don't have a clan, can't test this myself.
Maybe some else would like to test it out.
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I have a theory that I was gonna try when I was home last time the iron tomb was the daily mission that involved the iron artifacts. Not very sound, but potentially hidden enough that maybe nobody has tried it yet.