Tony Hawk's American Wasteland Codes -

Perfect grind:
Enter grindXpert as a case-sensitive code. REMEMBER: The bar will still fill, but you will not fall when in the red.

Perfect manual:
Enter 2wheels! as a case-sensitive code. REMEMBER: The bar will still fill, but you will not fall when in the red.

Perfect skitch:
Enter h!tchar!de as a case-sensitive code. REMEMBER: The bar will still fill, but you will not fall when in the red.

Unlock Jason Ellis:
Enter sirius-DJ as a case-sensitive code in the options menu.

You can also finish Story mode under the normal difficulty setting.

Unlock Mat Hoffman:
Enter the_condor as a case-sensitive code in the options menu.

You can also finish Classic mode under the hard/sick difficulty setting.

Unlock Mindy:
Enter help1nghand as a case-sensitive code in the options menu.

You can also finish Story mode under the easy difficulty setting.

Moon Gravity:
Enter 2them00n as a case-sensitive code in the options menu.

Cheat mode:
Clear all the gaps in each level to unlock the "Always Special", "Moon Gravity", "Perfect Manual", "Perfect Rail", and "Perfect Skitch" cheat options.