This Quest menu was hidden in the https://beta.linuxacademy.com. Recently, I found out I couldn't locate it, but I had in my browser history (https://beta.linuxacademy.com/#/quests) and I was doing the "Learn AWS by doing" (https://beta.linuxacademy.com/#/quests/dcfc4a56-ae05-4fe4-8afe-e683eec4fc47) and finally finished it. I didn't received any e-mail about that I've done all the steps, although all activities are marked as done. At the main dashboard (/quests/) it shows I have enrolled for three quests and none were completed at the Pizza graph.
So I think maybe Quests are deprecated, right?