Here is my 100% Achievement Guide for The Sinking City!
This is unmissable as you have to do plenty of archive searching in the game to find out our next clue and location to search etc!
But the first time you will get this is right after the "Extra! Extra!" Achievement, where you have to use the archives in "The Oakmont Chronicle" to find out where to go next.
The way it works is, you use left and right on the D-Pad to find the appropriate clue that we have (You know you have the right one as there is a little book symbol in the top right hand corner, indicating that is the clue we need to search).
Then there are 4 things we can use to narrow down the search "Perioid, People, Section, District" And within each of those has more options such as "Before the 1900s, before the floods" etc etc.
Just pick the ones either i do, or figure it out for yourself from reading the clues and you get this achievement regardless!
If you prefer to see a video method on it, go to 45:35 in my Part 1 video.
Hope This Helps!
Part 1
Part 2
Part 3