Press to drop down a console menu. Then type "enablecheats" and enter the following cheats:
Infinite Health: god
Full Ammo: allammo
Add Bots replace with an actual number of bots: addbots
All Weapons and Max Ammo: loaded
All Weapons and no Ammo: allweapons
Statistics for Audio: stat audio
Alters field of view replace with number of degreees: FOV
Change Player Name replace "name" with actual name: setname name
Set Resolution and Color replace numbers as desired: setres 1280x1024x32
Change Teams: switchteam
First Person View: behindview 0
Third Person View: behindview 1
Kill Yourself: suicide
Display Stats: stat all
Turn Stat Display Off: stat none
Exit Game: quit
Exit Game: exit
Stop Time: playersonly
Display Game Statistics: stat game
Kill Bots: killbots
Display Network Statistics: stat net
Toggle Full Screen and Window Mode: togglefullscreen
Disable Clipping and Gravity: ghost
Enable Fly Mode: fly
Disable Fly Mode: walk
Teleport to Crosshairs: teleport
Open Map replace "mapname" with the actual name of the map: open mapname
Change Gravity Setting replace with an actual number: setgravity
Change Jump Height replace with an actual number: setjumpz
Change Gameplay Speed replace with an actual number: setspeed
Display Frames Per Second Stats: stat fps
Set Slow Motion replace with an actual number: slowmo
Spawn Redeemer: summon xweapons.redeemerpickup
Spawn Assault Rifle: summon xweapons.assaultriflepickup
Spawn Avril: summon onslaught.onsavrilpickup
Spawn Bio Rifle: summon xweapons.bioriflepickup
Spawn Flak Cannon: summon xweapons.flakcannonpickup
Spawn Grenade Launcher: summon onslaught.onsgrenadepickup
Spawn Ion Painter: summon xweapons.painterpickup
Spawn Lightning Gun: summon xweapons.sniperriflepickup
Spawn Link Gun: summon xweapons.linkgunpickup
Spawn Mine Layer: summon onslaught.onsminelayerpickup
Spawn Minigun: summon xweapons.minigunpickup
Spawn Rocket Launcher: summon xweapons.rocketlauncherpickup
Spawn Shield Gun: summon xweapons.shieldgunpickup
Spawn Shock Rifle: summon xweapons.shockriflepickup
Spawn Sniper Rifle: summon utclassic.classicsniperriflepickup
Spawn Goliath: summon Onslaught.ONSHoverTank
Spawn Hellbender: summon Onslaught.ONSPRV
Spawn Instant Kill Shock Rifle: summon xweapons.supershockriflepickup
Spawn Manta: summon Onslaught.ONSHoverBike
Spawn Raptro: summon Onslaught.ONSAttackCraft
Spawn Scorpion: summon Onslaught.ONSRV