Have you actually got the second ending? If you didn't know already, there's an alternate ending that is based on Moral Points (which are subtly added in the game).
Yes, it's pretty much common knowledge on this forum. We have a thread about it already: http://www.lastlightforum.com/showthread.php?t=190&highlight=ending but I get why you created this one since no one posted in the first one in like 3 years.
