a helping hand - 5GP: swap an allies weapon for a Rocket Launcher, Fuel Rod Gun, Sniper Rifle, Beam Rifle or Brute Shot
skewer stopper - 10GP: end a players sword spree
pest control - 5GP: kill 5 drones within 10 seconds of each other
[Edited on 02.06.2012 3:10 PM PST]
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Wait, WHAT!?! 75 GP - Beat 'The Great Journey' without shooting a gun AT ALL or throwing a grenade. You cannot use a vehicles' gun(s), either. [Edited on 05.07.2012 5:29 PM PDT]