Most items are pretty much figured out, exception is really parts from the Anubis set & the weapons. So far, people have discovered that Anubis Mail is from surgery & Anubis Greaves are from startopia missions.

Assuming the spirit is from solving the riddle we're presented with, that leaves us with 3 Anubis items. I believe those are Anubis mask, Anubis boots and a neck item? I don't think we're given much hints on how to obtain them, the riddles in Secret of Growtopia seem to be used for something else, probably to obtain the spirit of Anubis or whatever.