To view achievements for Halo 3, complete the following steps: 1. Tap the Xbox Guide button located in the direct center of the controller. The button will have a bright green light in one of the four corners on the button, depending on what player number you are. 2. Tap the left bumper once. The bumpers are the horizontal shoulder buttons on the controller. The left one is marked "LB". 5. Now, it lists all Halo 3 achievements! Select on any option to view a complete description on how to obtain the corresponding achievement. If you have not played any Halo 3 games, view Step 6.