The easiest way to get this achievement is to complete Matts Side Quest "The Pledge" and he'll give you a Collectible Finder.
Go to you map and use your D-pad to make it collectibles only. Each character has 3 audio logs.(13 Characters-39 audio logs) You can obtain that characters audio log after you get to a certain part in the story. If you collect the audio logs and dont get an achievement then you have to progress farther to obtain their audio logs.
Heres a map-
Hopes this helps pm me or comment if you have any questions or anything to add to the solution. If you give me a negative vote please comment or pm why so i can fix it.