Screamer
25 Surgeon Kill an enemy with the Screamer by shooting one limb repeatedly. Fast Draw Kill an enemy with the Screamer the moment you have them in your sights. 50 Snapshot Demanding Kill an airborne enemy with the Screamer the moment you have them in your sights. Gunslinger Score two or more Fast Draws or Snapshots in a row. Just keep shooting while fighting a big group of weak enemies and you will get it eventually....