Hey there. According to your triumph you are missing pickup #8. Most guides will label #8 and #9 the other way around to how they appear on the triumph, and that is understandable as #9 is near the Gorgon Maze entrance and #8 is near the exit. Would you mind screenshotting the place where #8 should be? If you are looking at a guide, you might want to check where it says #9 is, it is near the exit to the maze, at ground level.