To kill the driver of the dump truck in the junk yard before it automatically kills Jenny on it's second pass you have to shoot the glass on the drivers side with gunfire and when the glass breaks the truck will stop.

Complete the following tasks to get the indicated GamerScore Points:

Celebrity - 0 GamerScore Points:
In Fragile Alliance play as Lynch.

True Elite - 0 GamerScore Points:
In Fragile Alliance play as Kane.

Sweet Revenge - 5 GamerScore Points:
In Fragile Alliance get personal revenge.

Family Member - 5 GamerScore Points:
Complete a Fragile Alliance session.

Some - 5 GamerScore Points:
From a Fragile Alliance heist escape with $50,000.

Bulletproof - 10 GamerScore Points:
Avoid using adrenaline on a level.

Return to Sender - 10 GamerScore Points:
Throw back enemy grenades.

Hindsight - 10 GamerScore Points:
Get that bird out of the sky.

Crime Buster - 10 GamerScore Points:
In Fragile Alliance kill 10 traitors.

Fragile Alliance - 10 GamerScore Points:
In co-Op complete the first level.

By the Grace of... - 10 GamerScore Points:
Lynch puts them out of their misery.

Headmaster - 10 GamerScore Points:
Get 47 headshots.

Behemoth - 10 GamerScore Points:
Stop the roaring beast.

Mercenary - 15 GamerScore Points:
In each Fragile Alliance scenario complete one session.

Rush Hour - 15 GamerScore Points:
Escape in ALL rounds of a Fragile Alliance session.

A Lot - 15 GamerScore Points:
From a Fragile Alliance heist escape with $1,500,000.

Damned if you do - 20 GamerScore Points:
Let them burn.

Sun Tzu - 20 GamerScore Points:
Let your crew do the dirty work.

Impact - 20 GamerScore Points:
Escape from death row.

Revenge Part II & III - 20 GamerScore Points:
Who's the old timer now?

Pushblade Symphony - 20 GamerScore Points:
Points for getting up close and personal.

Frag Out - 20 GamerScore Points:
5 with one fragmentation grenade.

Have Gun, Will Travel Part I - 20 GamerScore Points:
Travel into the Rising Sun.

Have Gun, Will Travel Part II - 20 GamerScore Points:
Counter-revolution.

Have Gun, Will Travel Part III - 20 GamerScore Points:
The Beginning of the End.

Bullseye - 20 GamerScore Points:
Lynch reacts fast at the Exchange.

Boomstick - 20 GamerScore Points:
Shotgun messiah.

Teflon - 20 GamerScore Points:
Don't take damage on a level.

Revenge Part I - 20 GamerScore Points:
Silencing the silent one.

Revenge Part IV - 20 GamerScore Points:
Shouldn't have gotten personal.

Double Trouble - 20 GamerScore Points:
In a Fragile Alliance round kill 2 traitors.

Cash Addict - 25 GamerScore Points:
In a Fragile Alliance round help to get ALL the money out.

Perfect Split - 25 GamerScore Points:
From a Fragile Alliance heist ALL players split the money equally.

50 to Won - 25 GamerScore Points:
Win 50 rounds of Fragile Alliance.

Revenge Part V - 30 GamerScore Points:
Glad it got personal.

Never Give Up - 30 GamerScore Points:
In a Fragile Alliance session get 3 personal revenge kills.

The Cleaner - 30 GamerScore Points:
In Fragile Alliance get 30 personal revenge kills.

No Going Back Now - 30 GamerScore Points:
In Co-Op go to the point of no return.

Damned if you don't - 30 GamerScore Points:
No rest for the wicked.

Crowd Control - 30 GamerScore Points:
Surgical precision in the nightclub.

Berserkopath - 30 GamerScore Points:
Make the most of Lynch's condition.

Veteran - 35 GamerScore Points:
Complete 200 Fragile Alliance sessions.

Mr. Popularity - 35 GamerScore Points:
In Fragile Alliance kill 100 traitors.

End of the Road - 50 GamerScore Points:
In Co-Op complete the game.

Most Wanted - 50 GamerScore Points:
From a Fragile Alliance heists escape with $150,000,000.

Mr. Play-It-Straight - 50 GamerScore Points:
Win 50 rounds of Fragile Alliance as a mercenary.

Iron Flower - 50 GamerScore Points:
Complete the game on Hard difficulty setting.

In the Havana level Freedom Fighters just before continuing to to El Capacito tell your men to take cover behind the large pointy statue and then shoot down the helicopter with RPGs. You'll need a few RPGs to bring the helicopter down, if you need more because you've run out go back to where you shot the APC vehicle and there will be supplies there.

To reach the final chapter in the game you have to move Kane in the correct direction when you have stopped the cargo plane by grabbing Jenny. Move Kane towards the village instead of the helicopter to progress.