Talk:Ghost/@comment-31120420-20170122174907/@comment-26536672-20170123051923

They key is that it all occurs under a single, contiguous savegame, probably in order. Helpfully provided in the pause screen is a statistics manifest, which shows information about your current run, including whether or not you have been spotted at any point or were responsible for any deaths.

I would guess that the true condition is merely that one must complete the game's final objective on a savegame that fulfills these stipulations, but again, that requires playing through.