Optional activities and quests like the mansion, alchemy mini-quest. Also, check out vagabond's camp and Octa church - they have their own small questlines.
Help function will give you tips only about the main quest and secondary objectives you discovered yourself. For example, if you won't visit Octa church on your own and take a quest there, help option in the menu won't mention it.
Besides, it's optional stuff - don't get fixated on it.
