Item description:

Here is a gamesave to test for the 100% all collectible achievement. Bearing in mind there is numerous achievements for Guide Book and secret files which already have all been collected.

So hopefully this will unlock all of the relevant collectible achievements after collecting the last audio recording which is located :

Audio Recording #5:
This recording can only be found inside the science facility, which becomes accessible during the quest “Way of Science” given by the NPC Harlow, which leads you to the BioSphere facility.
Instead of going inside the main building on the right, take a left through the minefield and enter the bunker that becomes available after the “Surplus” quest.
Inside, use the ladder to climb to the floor above, where the recording can be found.
The save is right outside the bunker so not much hassle to get there.