Achim, commonly Achim bei Bremen, is a municipality and the largest town in the district of Verden, in Lower Saxony, Germany. It is situateā¦Achim, commonly Achim bei Bremen, is a municipality and the largest town in the district of Verden, in Lower Saxony, Germany. It is situated on the right bank of the Weser, approx. 17 km northwest of Verden, and 16 km southeast of Bremen.