Press [T] for talk then type:

 MPGOD        - Godmode
 MPKFA        - Full Ammo, Armor, and Health
 MPHEALTH     - Full Health
 MPAMMO       - Full Ammo
 MPARMOR      - Full Armor
 MPCLIP       - Clipping
 MPPOS        - Show Position on/off
 MPCAMERA     - Adjust camera angle
 MPLIGHTSCAPE - Adjust Light Scape on/off
 MPTELEPORT   - Teleport to start
 MPONFOOT     - Walk
 MPMECH       - Use Mech
 MPVEHICLE    - Use Vehicle
 MPMIMIMI     - All weapons
 MPTEARS      - All weapons and unlimited money
 MPBOYISUCK   - All enimies destroyed
 MPTRIGGERS   - Cubes show actions
 MPBIGGUNS    - All characters carry big weapons

 WORLD [Name] - Teleports to the selected world, where [Name] might be

   01_Ambush
   02_Quarters
   03_MCA_Dock
   04_Shuttlebay
   05_LZ_Minotaur
   06_Entrance
   07_Avernus1
   08_Airshafts
   09_Comm1
   10_Comm2
   12_Comm3
   13_New_MCA
   14_Maritropa1
   15_Depot
   16_Slums
   17_Lost_Cat
   18_Slums
   19_Rendezvous
   20_Maritropa1
   21_Maritropa2
   22_Tram
   24_CMC_Sec1
   25_CMC_Sec2
   26_Tram
   27_New_MCA
   28_Airshipdock
   29_Airship
   30_Research
   31_Avernus1
   32_Museum
   33_Quarters
   34_Energy_Plant
   34_Spires
   35_Command
   35_Fortress
   36_Elevator
   36_Kato_Center
   37_Gabriel