Hey, I've been trying to get the completionist achievement, and am 99% done, but have hit a snag. I was getting the second last piece, a gold brick (which unlocked that secret room), but when I did, for some reason the very last piece, which was marked by a question mark vanished. It's the last armor upgrade, and I have no idea where it is. I'm not sure if this information makes any difference, but I'm at the part in the campaign right before the giant explosion in the room with the circular thing. Also, I have found all the parts of the suit since I have all the pass keys. Any help would be very much appreciated.
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