Diablo III: Reaper of Souls

To get this trophy you will need to open a rift as explained above, then close it again within 15 minutes. You can track your rift progress on the bar shown once inside the rift. When the bar is filled to 100%, then the Rift Guardian will spawn and once it is dead you can return to town and speak to Oreg and have him close the rift for you. The timer is very generous and if you have trouble getting this, try lowering the difficulty to make it easier.