Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Ambient (10 points)	Take optional photo #1 in Episode 4: Dark Room.
Balance (10 points)	Take optional photo #3 in Episode 4: Dark Room.
Dark Room (55 points)	Finish Episode 4: Dark Room.
Dioptic Power (10 points)	Take optional photo #6 in Episode 4: Dark Room.
Fisheye (10 points)	Take optional photo #7 in Episode 4: Dark Room.
Gamma Value (10 points)	Take optional photo #5 in Episode 4: Dark Room.
Manually Exposed (10 points)	Take optional photo #8 in Episode 4: Dark Room.
Rangefinder (10 points)	Take optional photo #4 in Episode 4: Dark Room.
Shutterbug (45 points)	Take all optional photos in Episode 4: Dark Room.
Slideshow (10 points)	Take optional photo #9 in Episode 4: Dark Room.
Time-Lapsed (10 points)	Take optional photo #2 in Episode 4: Dark Room.
Tripod (10 points)	Take optional photo #10 in Episode 4: Dark Room.