Marathon: Durandal (X360)

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.

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.

Make Someone Pay (10)
Get 20 Rocket Launcher kills in a Multiplayer game.

Marathon logo Gamer Picture.
Obtain the 11th Clan of the S'pht achievement.

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.

Vidmaster Gamer Picture
Obtain the Vidmaster achievement.