Go to the Google Play Store on your PC and log in using your account.
In the top left had navigation, choose the green "Apps" banner. Then you will have 2 options - "My Apps" and "Shop".
The "My Apps" view will show all the apps you have bought (free and paid).
You can also see your apps on your Android device using the PlayStore too. Slide out the left hand navigation pane and choose "My Apps". In this view two separate tabs. "Installed" and "All".
Hope that helps.