K, I've completed a game on hard where I got constantly pelted with pirates the whole match.  Not complaining as I actually like that because I play was playing as Vasari.  I see it as my free paycheck every time they attack me.  I often use the pirates to supplement my economy during games.  Well during this game, I killed over 2000 pirates.  I then noticed I didn't get the "Pirate Exterminator" achievement.  Thinking I had done something wrong I loaded a save and completed the match again.  And again confirmed that I had in fact killed well over 2000 pirates during that game when the achievement only requires 1000.  So I checked the global achievement board and it shows that nobody, not one person has ever achieved the "Pirate Exterminator" achievement.  This must be a bug.  Can this be investigated and fixed for an upcoming patch.

Also, it appears that nobodies ever achieved the "Outstanding Resume" achievement either.  Could possibly be a bug, but I don't have any saves where I can confirm this.  Only that it seems odd that no ones achieved this one either.  You may want to check this one as well.