Grand Theft Auto V (PS4) just had its three-year anniversary honored with a special event and login bonus. October 25th marked Batman: Arkham Origins's third anniversary, but WB Games is celebrating the milestone a tad differently than Rockstar — with a server closure.
A WB Games employee posted the announcement on the official Batman Arkham forums:
As of December 4, 2016, the online services portion of
Batman: Arkham Origins will be retired. We thank those that have joined us to battle over the last 3 years. The Single player campaign may still be played and enjoyed offline. For any questions relating to Batman: Arkham Origins, please contact WB Games customer service
http://support.wbgames.com/ As is often the case with online service discontinuations, it can be hard to tell which features use dedicated servers versus peer-to-peer servers, or if private matches will still be available. As a result, it is difficult to predict which trophies will be affected. Our system has flagged 11 trophies that require online multiplayer; these would be the ones of which to be wary:
The Clutch trophy in Batman: Arkham Origins worth 47 pointsKill a Hero to bring back your entire gang when at 0 reinforcements on a full multiplayer server
All of the multiplayer trophies are already quite rare with none earned by more than 18% of players. The rarity will only go up if they officially become unavailable.
If you're looking for like-minded gamers who are trying to clean up this set of trophies before the multiplayer functionality is lost, the Gaming Session Calendar is a great place to get started by either joining an open session or creating one of your own.
With regard to the closure, be sure to exercise caution as there is always a chance that the servers will become inaccessible earlier than the scheduled date depending on your timezone. According to WB's post, the online services will be retired as of December 4th. Although there is always a chance that the features needed to obtain every trophy might still be alive and well, most completionists would rather not take that chance.
We've got the full list of Batman: Arkham Origins trophies - check the list for guides to unlocking them.