In your orig post you mentioned two targets, remaining unbeaten against our rivals and the other target remaining unbeaten in the the group. Your questions were about just remaining unbeaten in the group campaign. There is a big difference between the two.
2006 wc qual campaign, the group of draws, if we had managed that 6th draw v France, i don't think we would have finished in top 2, would have been 4 teams on 18points and goal diff kicks in. But definitely one win and 5 draws would have clinched top spot there..
Our 3 rivals were unbeaten in that campaign.