On my YouTube channel I've created a gameplay walkthrough video covering Chapter 4 of this game. With this one I think I finally solved my audio setting problems mentioned in the guides for the first 3 chapters.
This is another pretty easy chapter. The first half there are few guards to avoid and some puzzles to get past rats. At about 29:30 I missed an achievement for sparing a guard. If you use tar on him it'll create a flash that blinds him and you can run to the door.
In the final section with guards when I noticed Joseph was covering me from the boat I tried to make a run for it. I made a wrong turn and died, and decided to stealth through. If you find you struggle here the video can show you where the door is. It may be worth sneaking as far as you can then rushing the door when you get closer.
If you found the video helpful, please consider giving a like and/or subscribe. This is a new channel on YouTube and any support is greatly appreciated
Edit: I've now created a video covering how to unlock the Mercy achievement. If you'd like to view a quick solution to the puzzles in this area and how to unlock that achievement here's that video.