There are 10 missions in Dead Nation. Each one has armor and loot for you to find. There are also mementos. Mementos are exclusive to the PS4 version but they don’t reside in any new chests. Instead, they are located in existing chests in the game, including ammo crates. You can spot a memento by the glowing purple light coming up from it with a memento symbol hovering above. As long as you loot all loot and ammo chests, you will get all the mementos. Mementos are not in armor boxes.

Watch the playlist above, or to quickly see a specific mission, go to my playlist on YouTube here – LINK