Marathon: Durandal Cheats

Level Select
Hold down the COMMAND and OPTION buttons and click Begin New Game. Type level number and select. Works with all marathon maps. This works for Marathon 2 and Marathon Infinity as well.

Achievements
Complete each of the following achievements below to get the allotted gamerscore.

11th Clan of the S'pht (27): Venture into the Citadel and learn the secrets of the S'pht.
Bigger Guns Nearby (14): Find the Assault Rifle in a Single player or Co-Op Game.
Bob-B-Q (14): They're Everywhere!
Hats off to 819 (21): The secret of 2401 lies within.
I'm Invincible! (10): Kill an invincible opponent with the Fusion Pistol in a Multiplayer game.
Make Someone Pay (10): Get 20 Rocket Launcher kills in a Multiplayer game.
Pfhor Score and Seven Years Ago (10): Win a Multiplayer game.
Pfhor the Win (42): Complete the Single player game in any difficulty.
SEVEN (7): Get seven fist kills in the game.
Tastes Like Chicken (10): Get 20 Tozt-7 kills in a Multiplayer game.