Must collect all engrams green, blue, purple Must collect all white triangle(pyramid)s (the bonus glimmer stuff) Must collect heavy ammo even if I'm full I'll waste rocket to pick it up Must buy something from Xur even if its just heavy ammo synth Must participate in all nearby public events (even on strikes) even Randall the Vandal ones (at least until I'm positive I can't solo it if no ones nearby) Must reload after 1-3 kills usually after engagements its a force of habit I picked up from Halo/CoD/Battlefield/Mass Effect/Fallout(pretty much every FPS I've ever played) (at least 20-30+% of my deaths happened while reloading) I put must because if I don't I become enraged, not maximizing potential gains/using available resources really irks me.