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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[i] Who Needs a Jetpack? [/i] 5G- Grenade Jump successfully 5 times to a ledge you normally wouldn't make it to. [i] I Need A Weapon [/i] 10G- Take out an Enforcer on foot.