- Achievements
Do the following things to obtain the corresponding Gamerscore points:

7 Points
SEVEN	Get seven fist kills in the game.
10 Points
I'm Invincible!	Kill an invincible opponent with the Fusion Pistol in a Multiplayer game.
Pfhor Realize and Seven Years Ago	Be victorious in a Multiplayer game.
Tastes Like Chicken	Get 20 Tozt-7 kills in a Multiplayer game.
Make Someone Pay	Get 20 Rocket Launcher kills in a Multiplayer game.
14 Points
Bigger Guns Nearby	Find the Assault Rifle in a Single player or Co-Op Game, it will let you kill more Pfhor.
Bob-B-Q	They're Everywhere!
21 Points
Hats off to 819	The secret of 2401 lies within.
27 Points
11th Clan of the S'pht	Venture into the Citadel and learn the secrets of the S'pht.
35 Points
VidMaster	I give no secrets.
42 Points
Pfhor the Be victorious in	Finish the Single player game in any difficulty.

- Marathon logo Gamerpic
Accomplish the '11th Clan of the S'pht' achievement to unlock the Marathon logo Gamerpic.

- Level select
Keep pushed the Command + Option buttons and select 'Begin New Game'. Then, type the level number and select. This works on all Marathon maps, and Marathon 2 and Marathon Infinity as well.

- Vidmaster Gamerpic
Accomplish the the 'VidMaster' achievement to unlock the Vidmaster Gamerpic.