Well, the easiest answer is My Room -> Material -> Spirit Origin List.
But it really depends on what kind of list you are looking for. The one I just mentioned needs to be filled in by summoning, fighting against or fighting with the servant as a support, and you can't get any info about servants you haven't summoned. But if you just want a quick list, it's not quite hard to complete, and it's as official as possible.
I don't know of any other official list, but the All Servants list on this site has exactly what you're looking for, with a lot more detail.
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