I just finished a 12 hour session where I was playing against 5 hard computer opponents, like 90 planets, went to the achievements screen, and no new achievements. What is up with that?? I should have unlocked 3 of the 4 vs hard opponents ( had already beaten vs 1 hard) but instead I got nothing. Feeling a bit cheated right now. Still got 19% left to unlock all achievements, so away I go.