1. From your starting point, turn around and head down the stairs, and towards a broken bridge, the memento will be at the end of the bridge, before the missing section.
2. After cutting the rope and the elevator shaft drops, wall jump back and fourth to get up the shaft, and once up top just walk to the left side of the shaft and the memento is right there next to the elevator shaft wall.
3. After you kill the sniper, the memento is right after him, between the small section of stairs and the mountain wall, on the right side.
4. After a battle with ninja's and assassins, you will jump up to a wooden plank path that extends out of the mountain, once up here turn around and jump up to the higher wooden plank platform, and from here just jump the gap to collect the memento.
5. This last one is right on the last ledge of the level before crossing the tallest bridge, if you get to a Samurai Battle where there is a Ninja Ninja Poker challenge available you’ve gone to far.