Go to the passwords menu. The codes are:

Campaign 1 - 8B45HP8TNMPT
Campaign 2 - 8B458P84NMPT
Campaign 3 - 8B45RP80NMPT
Campaign 4 - 8B45WP86NMPT
Campaign 5 - 8B45CP8XNMPT
Campaign 6 - 8B454P82NMPT
Campaign 7 - 8B45MP8YNMPT
Campaign 8 - 8B45YP89NMPT
Ending - 6RCX6K21Y0PT