He was the son of Hillerød Eggert Christoffer Achen and Johanne Georgine Wilhelmine Cecilie Tryde.
[2] He attended the Copenhagen Technical College and was admitted to the Royal Danish Academy of Fine Arts in January 1872.
Chairman of the Architects' Association of Denmark between 1910 and 1914, he was a Freemason and member of the Danish Masonic Order.
[citation needed] He designed several lodges for the Freemasons including one in Randers in 1881, together with Frits Uldall, and in Aarhus in 1908.
He collaborated frequently with the Aarhus architect Thorkel Møller, mainly in Central and South Jutland in the restorations of manors and hotel conversions.