Is there any reward for 100 percent completion of Batman: Arkham City, including all Riddler challenges and new game plus?
100% completion of Batman: Arkham City
batman-arkham-city
Related Solutions
The plans are in the back of Quincy Sharp's office. GameInformer has a video walkthrough describing how to see the plans for yourself.
From what I've seen and gained, there is maybe only one that is missable. However, you will have a second chance to get it if you go through a New Game Plus to get that achievement.
Catch
This one is not related to the main story, and is related to another achievement Mystery Stalker. You only meet a certain person 5 times during the game, and after that they are gone. You have to throw a remote controlled batarang at them.
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Best Answer
Yes, Perfect Knight - Day 2 for 360. There are equivalent achievements on the PS3 and PC (through Steam) as well.
Entire list of achievements (for 360): http://www.xbox360achievements.org/game/batman-arkham-city/achievements/