From the Main Menu, go into the Options screen and then to the Password Option. Enter the below codes as passwords exactly as shown.

Hestas*Retort
Infinite energy.

Commender*Jeffer
Access to all levels, missions, acts, and movies (at Main Menu).

Tranquillex
Super-cooled weapons.

Memo*X33RTY
Infinite secondary weapons.

All*cheats*off
Turns off all the cheats.

zX7z15EEvLax7Q0N
All Missions and Endings