At first I thought I was going to have a huge problem with this and have to go and find every one of them, but I actually got both achievements just going through the game once. You will come across text messages, audio logs, and video messages, just keep looking in every room and as you walk; you will come across many of them. You can miss 18 throughout the entire game meaning you do not need every single one, so don't fret if you miss one or two. There are 168 in total. You will also get a log for each time somebody talks to you and tells you what to do.