METAL GEAR SOLID V: THE PHANTOM PAIN

This achievement solution contains necessary spoilers! Read below at your own risk!

There a total of 11 memento photos that will need to be collected for this achievement. Ten of these photos are rewarded for completing Side Ops #51-#60, "Extract the Wandering Mother Base Soldiers." Take note that the last of these Side Ops will not unlock until Mission 38 has been completed. With that said, these Side Ops involve tracking down former Mother Base soldiers and extracting them. The catch with these missions is that the soldiers will run away if they spot you, meaning you'll need to neutralize them from a distance with a tranquilizer weapon. 

Alternatively, you can approach them while crouching under the cardboard box and they will instantly surrender to you when you've inch near them. If you want to change things up even more, you can even play the "Love Deterrence" cassette tape (once you've obtained it of course) and turn your iDroid's speakers on. This will cause the wandering solider to run up to you and surrender immediately. Further, you can bring Quiet along for these Side Ops (armed with the Guilty Butterfly) and she will tranquilize the wandering solider with ease once you've spotted the target for her. 

Once these ten photos have been collected, return to Mother Base's main Medical Platform and visit the secret infirmary room on the second floor. Here, you can give Paz each photo one by one (as shown in the video). After she reminisces on a photo, you will need to exit her room, smoke the Phantom Cigar for a few hours, and reenter the infirmary to give her the next photo. By the time you're ready to hand in the sixth photograph, she will still be asleep. At this point return to the ACC, complete a few missions, then come back for another visit and continue the photo-giving process. 

Once all ten memento photos have been handed over, exit the her room and you will find, on the left-hand side of the hallway, a small photograph taped to the wall. Pick it up and the achievement will finally unlock. For the sake of wrapping up Paz's story, make sure to revisit her once more after obtaining this photo. 

This achievement solution contains necessary spoilers! Read below at your own risk!

There a total of 11 memento photos that will need to be collected for this achievement. Ten of these photos are rewarded for completing Side Ops #51-#60, "Extract the Wandering Mother Base Soldiers." Take note that the last of these Side Ops will not unlock until Mission 38 has been completed. With that said, these Side Ops involve tracking down former Mother Base soldiers and extracting them. The catch with these missions is that the soldiers will run away if they spot you, meaning you'll need to neutralize them from a distance with a tranquilizer weapon. 

Alternatively, you can approach them while crouching under the cardboard box and they will instantly surrender to you when you've inch near them. If you want to change things up even more, you can even play the "Love Deterrence" cassette tape (once you've obtained it of course) and turn your iDroid's speakers on. This will cause the wandering solider to run up to you and surrender immediately. Further, you can bring Quiet along for these Side Ops (armed with the Guilty Butterfly) and she will tranquilize the wandering solider with ease once you've spotted the target for her. 

Once these ten photos have been collected, return to Mother Base's main Medical Platform and visit the secret infirmary room on the second floor. Here, you can give Paz each photo one by one (as shown in the video). After she reminisces on a photo, you will need to exit her room, smoke the Phantom Cigar for a few hours, and reenter the infirmary to give her the next photo. By the time you're ready to hand in the sixth photograph, she will still be asleep. At this point return to the ACC, complete a few missions, then come back for another visit and continue the photo-giving process. 

Once all ten memento photos have been handed over, exit the her room and you will find, on the left-hand side of the hallway, a small photograph taped to the wall. Pick it up and the achievement will finally unlock. For the sake of wrapping up Paz's story, make sure to revisit her once more after obtaining this photo.