Pause the game, select "Options", then "Cheats". Enter one of the following case-sensitive codes to activate the corresponding cheat function:
Enter "everythingproof" as a password.
Enter "generator" as a password.
Enter "herotime" as a password.
Enter "primus" as a password.
Enter "portal" as a password.
Enter "xlsmoothy" as a password.
Enter "hud" as a password.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points: