While I disagree with the Xur isn't earning while RNG is mentality, I'll humor you. From Nightfall: Achlyophage Symbiote From VoG: Vex Mythoclast, Hard Light, SUROS Regime, Thunderlord From 4th place in the Crucible: The Last Word From Bounties: Thorn, Bad Juju, Invective, Pocket Infinity And from Xur: 7 others. So about 2/3 of my exotics were earned through luck, since getting an exotic bounty is also RNG based. The only ones I feel I legitimately earned were the Symbiote, Vex Mythoclast (I didn't cheese Atheon on that particular night), and Thorn (since that's the only mildly difficult exotic bounty).