So did the grind, and probably nearing completion of it.
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I got almost everything in the store, except "Meta".
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You cannot ever unlock the last two motherboards. I beat "Skynet", which is supposed to be circuit 13, and now on "David's Domain".
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I'm at Story "70%". Not sure how to unlock the remaining "30%".
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I would like to note a pretty critical thing however. In both the screenshots, there is a bar "Time Multiplier". I never unlocked that thing. So I was always stuck at "base speed", which probably didn't help my experience.
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It is really annoying being maxed out on gear, and then never getting more gear of same type, so that I can add more cards to them.
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EDIT: So, acquired "Meta", and unlocked the aforementioned "Time Multiplier". And noticed I'm not quite at end of content yet.