Adjust Color Curves
It might come as a shock to some of you but Photoshop Elements is actually based on Photoshop CC. Of course, most of the features are unique to Photoshop Elements, but they have their origins in Elements' higher-end cousin Photoshop: Levels, Hue/Saturation, Shadow/Highlights, Brightness and Contrast, Image Size, Canvas Size—these are all identical to those in Photoshop.
And indeed, if you use a software plugin, such as Photoshop Elements+, you can actually open up and exploit legacy Photoshop features that are still present in Elements. One tool that's sort of part Photoshop and part Elements is called Adjust Color Curves (Enhance>Adjust Color>Adjust Color Curves).
The Curves tool in Photoshop is a useful feature and while Adjust Color Curves could be called the poor cousin, it's still a good feature with which to adjust the contrast in an image.