sorry, but they are all at max experience but i cant complete the last page, and cant do more than 1 upgrade to all the thing you can buy
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If you accumulate 200 war effort point you unlock a boss fight on the mission map, the boss respawn every few day so that you can do it with different kunoichi/outcomes. Those are the last illustrations of the gallery.
For the secret achievements take a stroll at night and search for a place where you can spend some time on your own.