Unlock Abilities
     You  can access the ability selection screen by pressing [Square]
on  the weapon selection screen. Abilities are unlockable bonuses that
let you do certain things, like carrying 3 grenades or having 50% more
health. You can unlock these abilities by aquiring a certain amount of
points. Poins can be collected by completing challenges.

50% More health: 300 Points
C4 Placement twice as fast: 100 Points
Carry 3 Grenades: 020 Points
Carry 3 Smoke grenades: 140 Points
Carry 3 Syringes: 060 Points
Carry 4 Pressure Mines: 220 Points
Carry Unlimited ammunition: 480 Points
Close Combat damage doubled: 260 Points
Trip Mines disarmed twice as fast: 180 Points
Your Buddy has 50% more health: 340 Points