Productivity in a game means that you are being productive with your time and completing your objectives in the least time possible. For example, when you go to the shop and you need 3 items, you won’t take 3 separate trips but you’ll buy everything at once.
This map from World of Warcraft, provides the player with the information of locations, in which you can complete a specific quest. It is up to the player to take route in order to hit all of the marks without having to go back anywhere. This is how a player can be productive with their time.