Hitman GO

There are 15 levels in the fourth chapter, each with a standard 3 challenges per level. The challenges can be done in multiple runs through a level, so they do not have to be done in a single play-through. In fact they often contradict each other, and so HAVE to be done in separate runs. Just keep restarting the level until you clear all 3 before moving on.

Here is a video walkthrough of all the levels in Chapter 4:

For those of you who prefer text guides, see the forum Guide here: LINK