Is it possible to create a text list of all my apps on the (Mac) App Store?
In systems up to 10.11.6 you can save the "Purchased" page as html file to disk:


Quit App Store.app
Open Terminal.app in /Applications/Utilities
Enter defaults write com.apple.appstore ShowDebugMenu -bool true and hit the Return/⏎ key to show the debug menu in App Store.app.
Open App Store.app (check that the "Debug" menu is available!) 



If you have some hidden purchases and want them to be listed also, unhide them in your account.
Open the "Purchased" page - log in with your Apple ID if required.
Hit cmdU
Quit App Store.app
Bring Terminal.app to the front and enter:

cp ~/Library/Containers/com.apple.appstore/Data/Library/Documentation/pageSource.html ~/Desktop/pageSource.html


and hit the Return/⏎ key. The pageSource.html file is now on your desktop and can be opened with a browser
(Enter defaults write com.apple.appstore ShowDebugMenu -bool false and hit the Return/⏎ key to remove the debug menu in App Store.app again.)
Enter exit and hit the Return/⏎ key.
Quit Terminal.app