Android - How to add a shortcut to the 'My Apps' screen of the Google Play Store?

You'll need an app like Tasker than can assign actions with activity launches. Create a New Task, name it, and Add an action. Go to System → Send Intent. Then fill out these fields:

• Action
  • com.google.android.finsky.VIEW_MY_DOWNLOADS
• Package
  • com.android.vending
• Class
  • com.google.android.finsky.activities.MainActivity
• Target
  • Select "Activity"

Assign an icon from the lower right. Leave Tasker. On your desktop, create a new shortcut, Task Shortcut, and select the task you named.