This achievement is story related during your third playthrough and cannot be missed. While doing the main story mission
Loss in chapter 11, after playing as 2B, you will switch to 9S.
When playing as 9S, make a save at the City Ruins: Near the Tower access point before going to the rope bridge. Going to the rope bridge near the tower triggers a cut scene. At the end of the cut scene,
NieR:Automata is written on screen in big letters. The screen goes black and the achievement unlocks.
If the achievement does not unlock when the screen goes black, you most likely have experienced a glitch. In this event, clear the cache. To do so, turn off the console by holding the
button on the console for at least ten seconds and then unplug the console for at least 20 seconds. Load the save you made before going to the rope bridge. Clearing the cache will most likely remedy the problem and you should earn the achievement at the black screen following the cut scene.