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On the level where you go and hook up with Dare, remember that Marine who is with you for about half the level and then is killed by the bug dudes when you jump done the pipe? After acquiring 29/30 audio logs he will stay alive and jump done the pipe with you, proceed as usual and sooner or later he will take yo to a door that was previously locked. He will then cuss out the superintendent and the door will unlock he tells you not to follow him but do it anyway. In the back of the room there is the final phone, download and play it, after a few seconds the marine will be like "you know to much" /spoiler alert/ he will then fire at you, just bust a silenced pistol cap in his ass and he'll go down like its 1970. GJ, you got all the audio logs and 75G.
EDIT: You can do this on any difficulty, you must not friendly fire the marine until he fires at you, you must have all 29 audio logs proceeding this one. 