There's been a shake-up and there's been some uncertainty and negativity, but Customs Night rolls on!
(Just in case you were wondering.)
All of us here are very much looking forward to playing ball with you next month and continuing to check out the best maps out there.

-josh

Since the Xbox 360 era, Xbox Live Achievements have provided an extra bit of joy for players of all walks, from those who loved to attempt the impossible, to others who enjoyed a stroll off the beaten path. For those Xbox players that measure their moments from bleep to bloop, we’re excited to unveil the next era of Gamerscore-garnering with the official Achievement list for Halo 5: Guardians.

Needless to say, in order to underpin your next Halo experience with Xbox Live’s simple symphony of satisfaction, you’ll be tasked with tackling the toughest campaign challenges, commanding your team in creative ways, collecting valuable ONI intel, making magic in multiplayer, showing Warzone who’s boss, and much, much more. You’ve got your Achievement list, Spartan. Now let’s hunt them down!
Below you'll find the 65 achievements, worth 1000 gamerscore, that will be available at launch."


( Full List / Source )