Enable the game console by adding 'enable_system_console=true' to the game's shortcut.

Example:

"C:\Program Files\CENEGA\UFO Afterlight\UFO.exe" --options scale_texs=1 video_caption=TRUE enable_system_console=true

During gameplay press ` to bring up the console and then type any of the following codes to unlock the corresponding effect.

Kill Everyone on Map - Enter during mission:
Kill_enemies

Adds Experience - Enter at People screen:
Add_experience #

Gives Resources - Enter at Global screen:
Resource_all

25+ of Each Type of Equipment - Enter at Global screen:
Full_store

List All Commands - Different Codes at Different screens:
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