Audiophile
From Halopedia, the Halo wiki
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Audiophile is an achievement in Halo 3: ODST. It is rewarded to players when they have found all audio logs in the campaign mode. It is worth 75 Gamerpoints. It is represented by a gray square with Audio lines going across it, with 100% written in the lower-right corner, and a picture of the Superintendent looking happy.
Gallery
A map labeling the locations of each audio log, save the 30th, which is earned in Data Hive.
Sources