Killzone: Mercenary - Mission 4 (Diplomatic Incident): Precision Contracts (walkthrough)

Contract loadout requirements: M80

The mission requirements:

• Finish the mission in 15 minutes
• Get to the elevator with Boris
• Extract within 3 minutes of leaving the bar
• Destroy the dropship with the M80

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Finish the mission in 15 minutes

Fairly doable since there very little restriction on this contract; you can basically rush the entire mission gun blazing or whatever and no door or lock-down will stop you with the exception of few cut scenes to slow you down. Simply put it, it doable within the time limit. The timer will end when the elevator door closes behind/in front of you.   

Get to the elevator with Boris

[Simply put it Boris, the bodyguard, must survive until the elevator door closes on you when you are inside it along with the boy.]

Recommend loadout:  
Armor: Supply
Van-Guard: Arc Missile
Grenades: VC-G11 Gas

Here the run down, while still inside the building follow Boris and shoot any RPG enemies. Uses the Arc Missile if you wish to. When you at the stair (still inside the building), throw your VC-G11 Gas grenade down stair and than activate your Arc Missile to finish off all remaining enemies. Recharge your weaponry at Black Jack (still in the building). After the talking scene and opening the door to the courtyard, rush toward the Black Jack. (enter to save the checkpoint if you wish to, recommend). Make sure your M80 Rocket Launcher is already out when you enter the courtyard so you can shoot and reload and shoot again at the dropship. Once done with the dropship, just activate your Arc Missile and throw your VC-G11 Gas at location you know the enemy going spawn. You may know this as camping in the FPS multiplayer world. Uses your primary weapon when need to if  you miss some. Remember to recharge your weaponry at Black Jack. After clearing out all the enemies (for now), more talking near the elevator and the kid crawl in to turn it on. When he does that; throw your VC-G11 Gas at the center of the courtyard and than activate your Arc Missile. You than rush to the center of the courtyard outside your own gas to kill all spawning enemies. You than return to the elevator and enter it when the game tell you and you done. Remember Boris must survive until this point.

Kill 1 additional enemy by exploding a flamethrower tanks

[You need to shoot the tank with a gun and not with any other preferable weapons]

I recommend you do this when you at the area where you above the courtyard. Enclosed spaces and hallway and plenty of enemies, what could go wrong? (famous last word?) 
      

Destroy the dropship with the M80

The dropship will arrive/appear the second you come out in the courtyard with the kid and his bodyguard. Make sure you have your M80 Rocket Launcher arm and ready so you can shoot it the minute it break through the glass ceiling.

This required several shot depending on how well you hit it, but if you miss then you needs some shooting practices in aiming. The dropship will fly away once it finish unloading it troops so beware.