Cheat List:
Edit the autoexec.cfg file in a text editor which can be found in the cfg directory in the game folder. At the end of the autoexex.cfg file add the line: wirbelwind. Note: Anytime you edit a game file first create a backup.

In game press ~ to bring down the console and enter the following cheats (toggle the cheats 0 or 1):
Invincible squad: godmode
Spawn indicated item: getitem
Toggle artificial intelligence:game_noai
Everyone transparent after game loaded: i_am_an_alien
Set squad members' level: setxplevel
Show all enemies and NPC: cheat_showall