Save game with 19 Remnant puzzles decrypted, with easy access to the 20th one to unlock the Cryptographer achievement. For Deluxe Edition.
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Before I ramble on, in case you missed it, this is for the Deluxe Edition only. Sorry!
This is pretty straightforward. Load the "Sara" save. It's a single file marked 4/29/17, at around 1635 (4:35 pm) or so, if I recall correctly. Take the gravity well down, run to the next room, then the room on your right. Look for the encrypted container (it's marked as a hidden cache on your map) on your left, and solve the puzzle (or use a key, it doesn't matter). It should pop the achievement. The game is set to Insanity, so if you have difficulty running past the remnants, change it.
I can't promise this will work for everyone, but if you have success with it, let me know in the comments! I appreciate any feedback!