Task Finder
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Although the overall quest is linear, there isn't one right way of getting through the game. For every island you have to visit to complete the quest, there are two that you could skip. But playing straight through the quest is just half the fun, that's why we have a complete index of Sidequests as well! But if you want to blaze through the game without taking detours, here's the entire walkthrough quest timeline, listed chronologically alongside the main objectives.
To find items not required to finish the game, consult the Side quests section. If you're looking for something specific, make sure to read the extended Items section.