I've made a quick search around the internet, but I can't find anything that gives you a detailed strategy for each conquest. Threads pop up pretty regularly about one or another of the conquests, so you could try looking back through the old threads. I remember there used to be one that listed which civ was easiest in each conquest. Sorry, that's the best advice I've got. Unless you wanted something for one specific conquest, then you could just start a thread about it.