HISTORY LESSON:
So, apparently there's a bug in the game where the "Illuminatus" acheivement doesn't fire. After spending two days going through the main game and Justine for all of the tinderboxes, the achievement still didn't fire. So, here's how I got the achievement any. (Please note that if you'd like to get them manually, there are 151 tinderboxes in the main game, and 5 in Justine. The library in justine has all 5 tinderboxes.)

To make the game give you the achievement, I made a hack that uses the code discussed in https://www.youtube.com/watch?v=1xK-B3P7Ucs - Props to Peter for digging up the function's name and usage to make it happen.

Keep in mind that you don't actually need to give your character all 500 tinderboxes, but there's no harm in doing that.