Full list of all 15 Marathon: Durandal achievements worth 250 gamerscore.
The base game contains 12 achievements worth 200 Gamerscore, and there are 2 DLC packs containing 3 achievements worth 50 Gamerscore.
Read every single terminal in the game.
Punched all switches, played on Total Carnage and never ever left a single Bob alive.
You are a member of the 7th Column.
Beat the game.
Completed the Citadel.
Killed an invincible opponent.
Spank'd 20 opponents.
Won a Multiplayer game.
Toasted 20 opponents.
Slaughtered 77 Bobs.
Got the Assault Rifle.
Punched seven enemies to death.
Killed a Juggernaut in Survival and lived to tell the tale.
Outscored every other player combined in King of the Hill or Kill the Man With the Ball.
Won a multiplayer game in every map in the Total Carnage Netmap Pack.