According to those achievements, there are 8 quests, of which it looks like 1 may be a tutorial quest, leaving just 7 story based ones.. Fallout had 14, 3 of which were tutorial leaving 11 story based. And Oblivion had a whopping 17, of with only 1 tutorial quest.
So either the quests are really long, or the main quest is really short. Is anyone else concearned?
AJV