A Steam achievement many are seeking to accomplish this holiday season is the "Merry Christmas" achievement in DEFCON. Pretty much all you need to do is nuke Santa Claus who is seen with his signature sleigh and reindeer as a white overlay on the DEFCON map in white. However, the task is kind of hard to do as Santa moves very quickly across the map. So here is what I recommend for all who wish to achieve the death of Claus.
1. Set your computer date to December 24th or wait until that day
2. Make a game with only 1 AI player