Achievement Thread - Guide on how to achieve them

Well the 30 grandchildren achievement does have a hidden requirement that at least two of the original children get to have children of their own. That's why I originally suggested starting a household of one parent of two children, and having those two children adopt.

More or less making a family tree like:
http://i.imgur.com/iCKwJc8.png


Okay that's ugly looking but you get the idea! ;)