I may have some information for you. My parents are in possession of a book thathas the Achenbach Family tree! Do you know from which Branch of the Achenbach's your're looking for? There is Achenbach 1, Achenbach 2 and Achenbach 3! This books dates back to about the 15th or 16th century. I will try to obtain the book, but my parents don't live close by! This may take a couple of weeks! I also know that my uncle, still living in Germany, has done some research into the family history. I will try to contact him and get all the info I can get! Contact me at firstname.lastname@example.org if interested!