Clear Down Achievement in Still Wakes the Deep

*MISSABLE*

Each time you enter a room, scan around for a phone on the wall. They all look identical; green with light-up numbers. If the phone is ringing, pick it up and listen to the chat that ensues. As long as you keep an ear out for ringing phones and keep an eye out, you should unlock this without any issues. Even if you don't hear a phone ringing, it's still worth having a look around and attempting to interact with any phones you find, just to be on the safe side. Also, be wary that sometimes a phone will start ringing as you're leaving a room, so it's often a good idea to step out, then go back to double-check you're not missing an incoming call.