Originally Posted by A 0 E monkey
The only thing I should add to the guide is that the ネガティブ人間ふたたび
achievement didn't unlock straight away for me I just had to pick the 11th trigger autosave from the 8th run and fastforward a little more, I was too anxious to quit out and should have waited for the quick save, my fault.
I did the same, but it didn't unlocked. I tried the 12th trigger autosave and it popped
Here's a pro tip guys, if you are not sure which save file to load after your 8th playthrough/ending, be sure to lock the last 5 quick save files with the 'Y' button, so it doesn't overwrite your files (turns green if you did it correctly)