Earlier on XboxAchievements.com, new achievements were posted for Disney Infinity 3.0. There are five new Achievements each for both the Marvel Battlegrounds Play Set and the Finding Dory Play Set. Though these Achievements did not show up in the recent final update, it is possible that they could be added in once the Finding Dory Play Set releases on June 17th.
Normally when Achievements or Trophies leak like this, it is the result of developers unlocking them during testing. This does not necessarily guarantee that these unlockables will be added to the game, but it does nearly confirm the existence of them.
These are the Achievements/Trophies for the Marvel Battlegrounds Play Set.
As well as the ones for the Finding Dory Play Set.