As odd as it sounds, I would not rely too heavily on the Notes tab for giving you detailed information on quests, objectives, and criteria. The notes are really only intended to serve as little reminders of quests that need to be completed, and will never provide a detailed list of objectives in step-by-step order.
While it is unconventional, I honestly recommend that you turn to the Underrail Wiki whenever you are stuck, but keep in mind that this naturally gives you access to spoilers and information on future quests and concerns.
Since the Notes tab is rather bare-bones, it is important that you, yourself, have a good note-taking system where you can write down objectives, names, quest information, etc.
Perhaps the Notes tab will be improved with the upcoming expansion, but 'til such a time it should really only be considered a brief To-Do List, or a list of boxes to be checked, if you will.