"Audio Enthusiast: Audio Diaries Location Guide"—Scattered throughout the episode's chapters, there are a total of 17 Audio Diaries to be collected. These "audio logs" provide additional insight into the story as well as life and culture within Rapture. The collection of all audio diaries results in the "Audio Enthusiast" achievement/trophy.
Listed below are their locations, indicated by chapter.
Chap. 2: Market Street (x4)
- Doing Well by Doing Good (Under counter in room where elevator is being repaired.)
- Observation #33 (Dressing room in Maison Vosges store.)
- The People (Inside the kitchen of the Watched Clock.)
- Offer of Employment (In Maintenance Room Supply Closet) [2-0-7-6]
Chap. 4: The Pavilion–First Floor (x3)
- Left Behind (Under the tunnel in the Menswear dressing room.)
- The Old Bear (Under the counter in The Daily Bread.)
- Critics (In back room in Haberdashery.)
Chap. 4: The Pavilion–Second Floor (x2)
- Message in a Bottle (On desk behind the locked door inside Ladieswear Jewelry.)
- Insufficient Postage (On table inside the Ladieswear Shoe Storeroom) [0-9-2-8]
Chap. 4: The Pavilion–Third Floor (x3)
- False Advertising (Inside the safe in front of Fontaine's Plasmids store.)
- A Gift from Fontaine (Behind the Shock Jockey door in Jack Frost's Village)
- Ghost in the Machine (In dressing room in Pret-A-Porter store. Freeze water to make a bridge.)
Chap. 5: Housewares (x5)
- Oven of the Future (On ground near television sets, in Electronics.)
- The Kiss (On kitchen shelf, in Bistro.)
- Observation #17 (On table, in Returns.)
- A Little Help (Behind locked door to Bridal, under counter.)
- Observation #22 (Staff Only area, freeze water to make bridge, on desk.)
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