Stealthy walkthrough on hard difficulty. All collectibles: Firefly pendants, artifacts, optional conversations, workbenches, training manuals, comics, safes, and shiv doors. Comic 1: 1:55 Shiv door: 2:57 Optional conversation 1: 6:00 Optional conversation 2: 6:19 Artifact 1: 7:31 Optional conversation 3: 10:17 Optional conversation 4: 10:24 Optional conversation 5: 11:49 Artifact 2: 13:03 Optional conversation 6: 13:40 Optional conversation 7: 14:20 Training manual 1: 14:55 Workbench 1: 15:11 Firefly pendant 1: 18:30 Artifact 3: 23:06 Firefly pendant 2: 34:41 Comic 2: 35:33