To enable the game console You'll have to add the following line to the game's shortcut:
"C:\Program Files\CENEGA\UFO Afterlight\UFO.exe" --options scale_texs=1 video_caption=TRUE enable_system_console=true
While playing You'll have to press [~] to bring up the console, then type any of the following cheat codes.
? - List All Commands (Different Codes at Different Screens)
full_store - 25+ of Each Type of Equipment (enter at global screen)
add_experience # - Adds Experience (enter at people screen)
resource_all - Gives Resources (enter at global screen)
kill_enemies - Kill Everyone on Map (enter in mission)