I just played all the way back through the game b/c the achievement didn't unlock, and when I got to level 10 there were ZERO collectibles anywhere to be had. It's like they glitched and completely disappeared from the game. I'm wondering if this might be what causes the glitch at least sometimes because they game can no longer even track if I've gotten them or not, since they no longer exist.
Fuck I don't want to do this POS a 3rd time for 100%.
400,000gs reached 1-13-15. Used D4 to get it (get it, it has 4 in the name) due to my disgust with how Halo: MCC has been handled. Achievement used for 400k milestone: Business as Usual.