I found all but 3 just exploring. The puzzles and encounters were not really a problem, because even though bungie tries to throw you a curve ball they still have a cut and paste sameness to things. At the same time the game has conditioned players in certain ways. Anybody who played the game for more than 2 days knows if you walk 5 feet to the left or right of a path you're going to have a visit by the architect, so some probably get shell shocked not to veer too far off the path. Since I'm one of those a**holes that think nothing of trying to jump a chasm with a sparrow, or climb where you shouldn't and dies 50 times trying to explore a stinking tree on a cliff, or have more fun wandering around the landscapes shooting at trees and buildings rather than do a battleground I found a few where I wouldn't expect it. I missed the one near the end of campaign where the path starts crumbling and they tell you to get out. Well, it turns out there was a fragment to be found on your way out. Really? The game just told me to get the f*ck out, not stop for coffee. That was a bit silly.