I think you could get by with a small number of missions, if they weren't linear.
People play quake 3 all day because the ending is never the same.
So rather then having one mission (get X from Y and bring it to Z) you could break it into the player groups deciding which role they would like to play.
Player Group 1: The team of adventurers
Player Group 2: The wizard king and his minions
Player Group 3: The gnomes that work in the tunnels
Each group has their own goal, so the story is not always the same.
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