Complete the following achievements to unlock Microsoft Gamerscore points.
First Time for Everything (5 points): Finish a multiplayer game.
Gravity is a Harsh Mistress (5 points): Toss a paratrooper onto the streets below New York on any difficulty.
Next Time Take the Stairs (5 points): Fall to your death during a multiplayer game.
Reservation for One (5 points): Make your way down to Hotal Langteau on Normal or higher difficulty.
Swirly Time! (5 points): Drown a German in a toilet in the Tower of London on any difficulty.
TV Repairs (5 points): Smash an enemy's head through a TV in the White House on any difficulty.
Combat Experience (10 points): Kill 50 enemies in the campaign on any difficulty.
One in the Chamber (10 points): Kill a player in a ranked match with the last bullet in a pistol clip.
Sharpshooter (10 points): Kill all the paratroopers as you make your way down the skyscraper on any difficulty.
Environmentalism (15 points): Complete 40 environmental or grapple kills on any difficulty.
MVP (15 points): Win an 8-player ranked or player match in Team Deathmatch mode with the highest score.
pwnt (15 points): Finish an 8-player ranked or player match in Deathmatch mode with the highest number of kills.
World Tour (15 points): Finish a multiplayer game on every map in every mode.
Defender (20 points): Help defend the barricade in New York on Normal or higher difficulty.
Dolly Madison Award (20 points): Save the Constitution from being burned on Normal or higher difficulty.
Exploding Monkey (20 points): Kill at least four enemies with one explosion on any difficulty.
Successfully complete Campaign mode to unlock the environmental, character, and weapon concept art at the Extras menu.
Successfully complete the game to unlock options to double your health regeneration, have unlimited ammunition, and get unlimited grenades.