[1] From April 1932, he also worked as a flying instructor at the Technikum Weimar, and in 1933 became chief test pilot for the Focke-Wulf company in Bremen.

In 1933 Hermann Göring proposed that Achgelis take a post as an instructor at the Deutsche Verkehrsfliegerschule ("German Air Transport School"), to establish and train an aerobatic team.

Achgelis turned down the offer, and he also refused Göring's request to take the position of Generalluftzeugmeister ("Luftwaffe Director-General of Equipment") after the death of Ernst Udet in November 1941.

He worked as a test pilot at an aircraft factory in Graudenz until the end of World War II.

In 1961, he was one of the founders of the airfield Flugplatz Oldenburg-Hatten[2] at Hatten, and in 1975, he received the légion d'honneur from France for his achievements in aviation.