Complete the following achievements to unlock Xbox Live Gamerscore points.
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There are 2 gamer pictures that can be unlocked while playing.
Complete the indicated tasks to unlock a Gamerpic.
Use the indicated weapon to get through the corresponding barrier color.
Collect all 12 Gold Bars to unlock a secret room. This secret room will be marked on your map and contains golden versions of every weapon.
Reach level 10.
Reach certain levels to receive different bonuses. All bonuses are carried over to New Game+ after obtaining the weapon again.
Reach level 20 to unlock the full map that reveals the locations all items, weapons and other items.
Save the game at a checkpoint. Leave the room, pause game play, and select the "Load Checkpoint" option. You will retain your current health and ammunition and restart at the checkpoint where you can re-collect the health and ammunition there. Repeat this as many times as needed.