Chapter 2: On Your Own mission in Dead Space 3 has only one Log that can be collected (and you need it for The Librarian achievement) and they did not even try to hide it. Nevertheless, here’s a guide showing its location … just in case ;).
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Audio Log
Just as the level starts you will see the audio log in the room next to the one you start in.
Chapter 2 begins …
.. moving straight will get you to this “hidden” audio log