Its really easy to do, and i wouldn't be surprised if people found this out by themselves.

Basically; When you get an ending, after you get the achievement for it.

Just ALT + F4

seriously, the game wont clear your save until sometime after you hit start game so you should be able to go through every memory while repeating this (and also getting the achievement for each ending).

Once you load back in you should be able to start game and you will end up back in front of The End.

Because i mean, look at all these.

I can't imagine doing it 11 times.


Hope This Helps