At the main menu press ~ to bring up the cheat console, then enter the following: unlock all

Press the Y (talk)/tilde button and erase the text that says ''say'', enter any of the codes and press enter:

Third person view - behindview <0 or 1> (0 means off 1 means on)
Flight mode - ghost
Disable flight – walk
Full ammunition - fullammo
Record demo – demorec
Stop recording - stopdemo
Play demo – demoplay
God mode for player - god
God mode for team - godteam
God mode for terrorists - godterro
God mode for hostages - godhostage 1
Disable god mode (hostages) - godhostage 2
All the god modes – godall
Game never ends - toggleunlimitedpractice
Walk through entities – togglecollision
View threat information – togglethreatinfo
Kill all terrorists - neutralizeterro
Disarm all bombs - disarmbombs
Deactivate IO devices - deactivateiodevice
Rescue all hostages - rescutehostage
Disable morality - disablemorality
Summon all terrorists - callterro
Invisible to terrorists – playerinvisible
Terrorists surrender on sight - tsurrender
Terrorists shoot wildly - tsprayfire
Terrorists only fire at you - taimedfire
Terrorists all run away - trunaway
Terrorists go back to normal – tnothreat
See all terrorists on map - rendspot
Hostage threat information - togglehostagethreat
Set hostage position - sethpos <0-5> (0 standing, 1 kneeling, 2 prone, 3 fetal, 4 crouched, 5 random)
Reset hostage threat - resetthreat
Next hostage animation - hna
Previous hostage animation - hpa
Animate hostage - hp <0 or 1> (0 for no loop, 1 for looping)
Show field of vision - showfov
Show weapon direction – gundirection
Show terrorist/hostage routes - route
Show all map routes - routeall
Remove all NPCs - killthemall
Remove all terrorists - killterro
Remove all hostages - killhostage
Kill all Rainbow operatives – killrainbow
Remove opponents - killpawns
Game modes - sgi
Resets all cheats – resetmeall
Quit game – quit

Enter in console window (using ~) - completemission