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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tactician II - 40GP: manipulate a grunt in cairo station to stick you right before an energy barrier recovers deflecting the grenade to stick himself or one of his allies, the explosion must kill the stuck victim