I have completed the story without finishing all of the Dark Knight systems 'Worst Nightmare' tree (basically the challenges which reward you XP and gadgets for predator encounters).
To complete the rest of them I need to find more 'predator encounters', but what actually counts as one of these encounters? Is it just determined by a rooftop full of armed guards, or are they limited to the story section of the game where you are contained to a room?
If it is restricted to the story encounters, does your progress on the Dark Knight system get taken over when you start a NG+?
Best Answer
Predator encounters only count toward the Worst Nightmare Dark Knight track when they occur while following the story. Once you finish a predator encounter during the story, you can't repeat it to pass off any Worst Nightmare requirements.
I know this because I went back to the top of the GCPD building after my first encounter and tried to earn Finish a predator encounter without being seen and Use a sonic batarang to lure an enemy into a takedown without success. My next in-story predator encounter, however, I earned the Finish a predator encounter without being seen. I'm on the PS3.
I suggest picking one rank (or more if you can manage) to earn for each encounter. If you make a mistake during the encounter, pause and restart. If you fail to earn all ranks during the main storyline, you'll have to try again during New Game+.