Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Assault Flags ( 10 points )	Single Player: Collect all of the Flags scattered throughout the game.
Escapist ( 20 points )	Zone Battle: Defeat all spaceships in Areas 29 & 30: Medium or Hard difficulty in one session.
Fearless ( 20 points )	Single Player: Complete 3 sequential areas on foot: Medium or Hard difficulty in one session.
Heroes Campaign ( 30 points )	Co-Op Campaign: Complete all areas on Hard difficulty with the help of a friend.
Hot-wired ( 10 points )	Single Player: Capture all 3 hijackable vehicles at least once.
Ice Cold ( 10 points )	Single Player: Freeze 50% of infantry in any Zone: Medium or Hard difficulty in one session.
Moby Dick ( 10 points )	Single Player: Destroy the Mecha Orca.
Pyromaniac ( 10 points )	Single Player: Burn 50% of infantry in any Zone: Medium or Hard difficulty in one session.
Smoothie Heroes ( 20 points )	Co-op Campaign: Kill 100 infantry, one player freezes & the other shatters, on Hard in one session.
Underground Hunters ( 20 points )	Co-Op Campaign: Finish all underground areas with the help of a friend: Medium or Hard difficulty.
Wonder twins ( 20 points )	Zone Battle: Use all 4 Co-Op attacks, kill 10 units with each: Medium or Hard in one session.
Zoned Out ( 20 points )	Zone Battle: Complete 6 Zones, each with the help of a different Xbox Live enabled friend.