Antihero achievement in Spider-Man: Web of Shadows

Secret Achievement: Antihero
Description: Black Suit Conclusion achieved

This achievement refers to 1 of the 4 available endings to the game. To get this particular ending, when you are presented with a Red suit or Black suit choice, you must make more Black choices than Red. However, when you finish the fight with Symbiotic Black Cat, you MUST make a Red choice.

There is a way to get this achievement and the other primarily Black suit ending achievement without too much hassle. Play through the game making every Black choice until you hit Act 3. During act 3 you will get a mission where you will have to defend a church followed by a boss fight. At this point you will be prompted to Return to Harlem.

Make a manual save here.

Continue the game as normal making red choices. After the game is over, load that save and play the game making black suit choices. There are 2 times you get to make a choice after that save, right after the next boss fight and at the very end of the game. There is another time in which the game automatically will make a choice for you based on how many of each type of choice you made. Making more blacksuit choices should cause the game to automatically choose black suit.