There are a total of 12 Audio Log collectibles in Aliens Colonial Marines. Finding all of them will earn you the “I Heard THAT” trophy / achievement. They will also give you some nice bonus XP to level up faster. By holding down the select-button you can see how many collectibles you have found in the current mission and your objective is shown as well. After finding an Audio Log it will be saved automatically. You can quit the mission right away without losing your collectible progress.
#1 (Mission 1) – After going through the circular room that has a big rotating machine in the middle you will come to a room with many computers and one single Lurker will attack you. The audio log is on a table in this room.
#2 (Mission 2) – After opening the door with the loader, keep moving until you get to a door that needs to be cut open. Before opening the door, turn around and the audio log is in the same room.
#3 (Mission 2) – In the room with the big red window (a heavy soldier will be shooting at you from the other side). The log is sitting on on green generator on the right side of the entrance. You might need to jump to grab it.
#4 (Mission 3) – In the beginning of this mission you need to enter a building. After entering the building go down the corridor in front of you and the log will be in a small room to your left.
#5 (Mission 6) – When you drop down to a scaffold (after going through a building) and Bella says “I really hate heights” you need to turn around. At the end of the scaffold you will see this audio log.
#6 (Mission 6) – Just a minute after picking up the last audio log you will enter a building with turrets. Near the entry is a small room on the left side. Inside is the next audio log waiting for you.
#7 (Mission 6) – Almost immediately after pickup up the last log you will have to deactivate a turret at the end of a corridor. Once it is offline, go to the other end of the corridor and cut open the door. Enter the room and the log will be in front of you.
#8 (Mission 7) – When entering the labs you will get to see a cutscene. In the next room you will see a scientist behind a window. The audio log is at the same place where the scientist is standing.
#9 (Mission 7) – One minute after picking up the last audio log you will come to the morgue. The audio log is in the morgue, next to a dead body.
#10 (Mission 7) – After the section with the APC you will go into a building. After opening the first two doors, look to your left. The log is inside a little office with lots of computer screens.
#11 (Mission 8) – Immediately after the mission starts, walk down the corridor and in the next room go into the smaller side room to your right. The audio log is sitting on a table at the end of the side room.
#12 (Mission 8) – The last audio log can be found after entering this huge underground structure inside the mountain. There are three small buildings. The first building that you come across has the final audio log sitting on a desk.