There is currently no way to indicate task logic to players outside of having them [F3]+[H] or by spelling it out in the quest description that doesn't always get read (a frustration for another day).
A great fix would be to simply put the task logic inside of the quest pages, right next to the task type title. As an example, if there was a Retrieval Task, at the top right where it says "Retrieval Task" it would also say right next to it "(AND)" or "(OR)," with a mouse-over pop up describing what that means to the player ("You have to complete all tasks" or "You only have to complete one task").
There is currently no way to indicate task logic to players outside of having them [F3]+[H] or by spelling it out in the quest description that doesn't always get read (a frustration for another day).
A great fix would be to simply put the task logic inside of the quest pages, right next to the task type title. As an example, if there was a Retrieval Task, at the top right where it says "Retrieval Task" it would also say right next to it "(AND)" or "(OR)," with a mouse-over pop up describing what that means to the player ("You have to complete all tasks" or "You only have to complete one task").