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As this guide states, the No Stone Unturned achievement for real means 1 session. I read somewhere else that you might could take advantage of the "Continue" option from the main menu- that will not work. Since this was my 3rd playthrough and I had a lot of reference notes I was able to speedrun in about 2.5 hours. All the solutions, codes, etc. are consistently the same EXCEPT the Ext. PSI setting for the Dive Suit and the 4 digit Security Code you get from the yellow Key-Card that's used in a few places. These 2 change with every playthrough. The achievement popped for me after the post-credits scene.
VHS tapes stay collected across all playthroughs. So if you miss a few, you can start a new game and just play up to where you need. The previously acquired VHS tapes won't even be in the game anymore since you already collected them, but they will all show in the Collections screen.