After finishing the game chapter select to Level 2 and interact with the phone and enter 0447 and the achievement will unlock.
I show this Achievement in my Walkthrough starting at 31:44 minutes into the video.
Timestamps:
Level 1 0:33
From Black to White 2:10
Level 2 3:51
Numbers 3:55
Level 3 6:19
12:40 Only Red
Keep Walking 14:24
Level 4 15:43
Level 5 19:35
Level 6 24:38
Level 7 28:28
Wrong Number 31:44