These are quests you need to complete for the main story to progress. If you clear all of the main story in a given map, the route to the next area opens.
These are alternate quests that are also available under the main story menu which gives more information about the storyline.
These are quests that do not feature a story to progress or open a new route to be explored. These quests sometimes yield Wanted Posters as rewards!
As pirates constantly become stronger and their levels higher, a specific pirate story quest opens up. Upon completion, pirates will be awakened, gain additional skills and will become stronger. They will also gain an additional cool look.
These are quests that are only released when certain conditions have been fulfilled. Hidden quests that have been opened can be shared with friends. But keep in mind that hidden quests will close after a certain period of time has passed.
Daily Missions and Achievements
Daily quests are quest which you can repeat daily. To access or claim the rewards go to the lower left section of your Hideout for the "Mission" icon.
Achievements are quest that you can finish to receive additional rewards. These quests are not repeatable but most of the quests gives you accumulated rewards when you have reach a certain point of the quest.