Can you tell us, which place you pick up Abyssal Armor?
Did you pick the one in Eden up?
I only started to tick off the armour pieces somewhat near the end stupidly, so I have a few unticked ones that I have gotten. I have 9/10 pieces and three unticked ones. But yes, I got the one in Eden
The ones I havn't crossed off are:
Drowned Pass (Shadow Realm)