I have completed a skirmish game with three different nations but the game will not acknowledge I have completed a one on one with an intermediate AI. What am I missing about the requirement to complete Test of Strength 2 ??? I can not get past the sixth goal in Masteries.
Try restarting the game before. Also, be sure to be online.
Loading any saved game seems to break the achievements as well.
I had no trouble with them starting from a fresh game and ending with any victory type.