This game is listed in the "Missing Achievements" section of this site. Perhaps I can confirm which achievement that is, or at least one of them (if there's more than one). It is "Fur Coat" - Defeat Sable in Mission 9: Shock Verdict. I killed her with the Eclipse and no achievement popped up so I was expecting it at the end of the level but was dissapointed. Unless you have to defeat her with Geary? but I don't think so.