The Amazing Spider-Man 2

This is simple enough to get around story chapter 6 you will be forced to take out a Russian gang hideout after that every few story missions one will appear on your map as a purple eye icon. Do all five of these as stealthy as possible and the achievement will be yours. Note that I say as stealthy as possible because if you make to much of a ruckus you will fail the hideout mission and have to restart. Each hideout only has 5-10 people in them so they aren't to hard.