James, Thanks so much for all of the work on the ACHIN family history. I have been working on my French Canadian history (my father's side) for some time and just came across your great work. My surname ARCHEY is an Americanization (or misspelling/hearing) of the French name. It also comes up as Archie, Archy, etc.
My great grandfather Pierre ACHIN/M (Peter Archey) came to Northern NY as a young child from Laprarie are in Quebec in 1845 or 1846 and settled down in Black Brook, Clinton County, NY where the family shows up in the 1880 US Census. In the late 1880's they left and moved to Western Massachusetts (Pittsfield area) and worked in the woolen mills. Some of the family including Peter and his spouse Adeline Sicotte spent some time in Lowell MA (1900 census) to work in the textile mills there. They returned to Pittsfield in 1901 and remained there. I was born in Pittsfield and now live in Seattle WA.
My current "roadblock" is in the transition from Quebec to northern NY. I have found the records for Francois' marriage to Marie GIROUX in 1833 (#29 in your tree) and the record of Pierre's birth to Francois and Marie (St Edouard) in 1845. I have also found baptism records for Pierre and Adeline's children in the NY churches but little regarding Francois and Marie Achin. Francis and Catharine Archey show up in the 1850 Black Brook census but not Francis and Marie. I can't even find a Marie Catherine that could help the mystery. Francis and Catherine Archie show up in the US 1900 census in Plattsburgh and Francois Achin and Catherine Boyer show up in the records of St Peter's in Plattsburgh in 1865.
I originally thought that Francois and Catherine were Peter's parents but after I found the marriage and birth records noted above, I have but that couple on the back burner. The 1880 US Census for Black Brook NY shows that Peter Archy/Achin’s mother Mary Archy was living in the same household and was age 65 and widowed which would put her birth date about 1815 and Francois’ death before 1880. This source also indicates that Mary was born in NY (parents in Canada). Have not been able to verify this one way of the other.