Board Thread:General Discussion and Questions/@comment-68.4.218.111-20160413041616/@comment-24668482-20160413065148

There is 996 unique quests in the game. If you have opened all locations, and see that you have around 996 quests completed in the 'Top Seekers' section of the top 100 list (if you have near that number you should hopefully show up there, though it is not the most stable list in the world, otherwise use the 'friends only' option to see your stats). Some of those quests were part of timed challenges and are no longer available for new players to play, so if you started after those particular update events you will have a lower total number of quests over all. that is just a maximum, but anything over 900 would suggest you are close to or at your limit.

If that is the case, then you will have to wait for an update for the game to be released. Each update adds new quests, typically around 100 new ones. They are released every couple of months.