Collectibles
There are four kinds of collectibles hidden throughout Banoi; the Colored Skulls, Personal ID Cards, Fact Books, and Recordings. Most of them are hidden in plain sight and are easily missed when you rush towards an objective. Be sure to look around the entire building/area you are in, you may find more than you were expecting.
Apart from the Colored Skulls and Developer Mods, the other items count towards your one-hundred and forty item collectibles (for the in-game Challenges). You need to only collect one-hundred and twenty items for the Nearly there achievement / trophy.