Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A-maze-ing ( 30 points )	Mission 2: Contact: Escape the Replica Forces without killing any Heavy Armor.
Batten Down the Hatches ( 15 points )	Mission 3: Influence: Close all of the sewer hatches.
Collateral Damage ( 25 points )	Mission 3: Influence: Kill an enemy with an exploding vehicle..
Cut Me Some Flak ( 20 points )	Mission 1: Foxtrot 813: Destroy all of the helicopters.
Dead Weight ( 30 points )	Mission 4: Rebirth: Kill all fast-ropers before they hit the ground.
Find Paxton Fettel ( 35 points )	Complete the "Reborn" campaign.
Foot Soldier ( 30 points )	Mission 1: Foxtrot 813: Complete the level on foot without an EPA.
Miniature Replica Soldier! ( 15 points )	Crank up "Miniature Replica Soldier" theme song.
Tour de Force ( 30 points )	Mission 4: Rebirth: Destroy a Powered Armor unit in under thirty seconds.