Ann

In the dark garage area, take the key near the end, turn around and walk back to the entrance of the screen/area. You'll arrive in a "digital art department" themed room. If you're quick, it's possible to find a find computers with their screens lit that you can activate to see extra "memories" - but you don't need to do it for the achievement. Just walk around until it gets dark, and you'll get the ending. You'll unlock the achievement!