Reach level 20 to unlock the full map that reveals the location of all items, weapons, and other items.
Reach level 10.
Reach level 30.
Reach level 40.
Reach level 50.
Collect all twelve gold bars to place a marker on the map to a secret room. The room contains the golden versions of all guns, which give double experience points.
Defeat the first Tarantula to unlock a Gamerpic. Get the facemask to get all the pieces of the XOS-7 Omega Armor to unlock another Gamerpic.
Save the game at a checkpoint. Leave the room, pause the game, 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 desired.
Use the indicated weapon to get through the corresponding barrier color:
Accomplish the indicated achievement to get the corresponding number of Gamerscore points: