This is a Public Service Announcement, the servers for Ultimate Mortal Kombat 3 are now online. The ranked servers had previously gone down a few months back. It was assumed at the time that when Midway had been liquidated through their bankruptcy hearings, the support for some of it's legacy games on the 360 would cease. Midway titles like Ultimate Mortal Kombat 3, Paperboy, and Gauntlet mysteriously disappeared from the marketplace and ranked servers could no longer be reached.
Today we have been receiving reports from gamers that the servers are now back online for Ultimate Mortal Kombat 3. It is unclear on how long these servers will stay up, but they are operational for the time being.
With that in mind, previously discontinued achievements are now achievable.