Cheat List :

Press ~ in game to access the console and enter the following codes: 

All god modes: godall 
God mode for player: god 
Full ammunition: fullammo 
Walk through objects: togglecollision 
Animate hostage: hp <0 or 1> 
Deactivate IO devices: deactivateiodevice 
Flight mode: ghost 
Disable flight: walk 
God mode for hostages: godhostage 1 
Disable god mode (hostages: godhostage 2 
Disable morality: disablemorality 
Disarm all bombs: disarmbombs 
Game modes: sgi 
Game does not end: toggleunlimitedpractice 
God mode for team: godteam 
God mode for terrorists: godterro 
Hostage threat information: togglehostagethreat 
Invisible to terrorists: playerinvisible 
Kill all Rainbow operatives: killrainbow 
Kill all terrorists: neutralizeterro 
Next hostage animation: hna 
Play demo: demoplay 
Stop recording: stopdemo 
Previous hostage animation: hpa 
Quit game: quit 
Record demo: demorec 
Remove all hostages: killhostage 
Remove all NPCs: killthemall 
Remove all terrorists: killterro 
Remove opponents: killpawns 
Rescue all hostages: rescutehostage 
Reset hostage threat: resetthreat 
Resets all cheats: resetmeall 
See all terrorists on map: rendspot 
Set hostage position (0 = standing, 1 = kneeling, 2 = prone, 
3 = fetal, 4 = crouched, 5 = random): sethpos (0-5) 
Show all map routes: routeall 
Show field of vision: showfov 
Show terrorist/hostage routes: route 
Show weapon direction: gundirection  

Bloody alien mode:
Enabel the following codes in order: explore, clodhopper, 1-900, and teamgod. To 
get bloody, throw a grenade on the ground and let it explode near you. 
Alternately, you can switch your people and make him shoot at you then switch 
back to your original character.