I found a way! Go to your Google Play Store, touch the apps tab. Then touch the apps spot again found at the very upper left spot with the Google Play icon. If you are logged into an google+ and/or a gmail account, then it will display your name and have the options: Store home, My apps, Shop apps, My wishlist, Redeem. Touch my apps and it will reveal all the apps you've ever downloaded and/or uninstalled since then. Each app will have a faint gray " x " on the upper right corner of their own icons. Click on the " x " to delete it.
Unfortunately, I haven't found a way to clear it all completely, but at least you can clear the ones you don't really care to have on there anymore like for me it was all the high end games that didn't deliver when you got them. Or spend about 20 minutes and erase them one by one. Hope that helps!