Killzone: Mercenary - Mission 2 (Code of Engagement): Precision Contracts (walkthrough)

Contract loadout requirements: Mantys Engine, M82

The mission requirements:

• Achieve an explosive barrel kill from a zipline
• Finish the mission in 15 minutes
• Kill 10 enemies with Mantys Engine
• Headshot 30 enemies with M82 rifle

Comments: This is more of my complain but you might see it as an unskillful person yakking about nothing important. Anyway this contract is quite troublesome with that time limited amount to finish in, if only they give more time like 5 more minute than I wouldn't care about the kill requirement. It troublesome because of the two different type of kills requirement from two different weapon that are design for different purpose. If they were similar purpose weapons, then this wouldn't be a issue. The M82 rifle is powerful and can get headshot with no problem even over certain range when aim right but it make noise every time it fire which in turn draw enemy in and rise the alarm. This wouldn't be a problem except the other kill requirement is not design for head on fight. The Mantys Engine is design for sneak behind kills and another issue with this is that it can be easily shot down if seen. So if I were you, go focus on the Mantys Engine kills first before the M82 kills. Now how I did on this contract is that I barely made it in time with a few seconds (yes second, not minute) to spare because of the Mantys Engine requirement. I also like to note that I'm not that skilled in using Mantys Engine which also cause me to slow down and cost me time.        
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Achieve an explosive barrel kill from a zipline

There only one places on this missions that has a zipline for you to cross, so all you need to do is practices to aim well when coming down and of course time it just right when an enemy is near the barrel so you can get that kill when you blow it up with your weapon. 

Finish the mission in 15 minutes

Depending on your skills of usage on the two weapon kills requirement, this may or may not be an issues.

Kill 10 enemies with Mantys Engine

Advise: Practice how to uses this weapon, do this objective as early as you can, and try to finish this objective before you enter the ship because it more difficult trying to use this once inside the ship.
   

Headshot 30 enemies with M82 rifle

Not much need to be say about this requirement, you just need to shoot and get head shot.