Back At It Achievement in Halo: The Master Chief Collection

As a means of celebrating the launch date of the original Halo 2, this achievement simply tasks you to play the aforementioned game on the 9th of any month. This can be done by playing any of the ten Campaign missions and even messing around in a Custom Game with friends or hopping online and playing a match on a Halo 2 map. Overall, this achievement is pretty straightforward and can be obtained with minimal effort of your part.