The Achilia sinuaticornis, A. kindermanni, A. humidula, A. praeclara, A. nigrita, and A. rufula species groups sensu Jeannel (1962 and 1963), and Achilia incertae sedis species according to Jeannel (1962) and Franz (1996) of the species-rich genus Achilia Reitter, 1890 are revised. Of the seventeen taxa placed in these seven species groups (including incertae sedis species), seven names are placed in synonymy: A. curta Jeannel, 1962 = A. longiceps (Reitter, 1885) syn. nov., A. elongata Jeannel, 1962 = A. humidula (Reitter, 1885) syn. nov., A. occipitalis Jeannel, 1962 = A. humidula (Reitter, 1885) syn. nov., A. diademata Jeannel, 1962 = A. humidula (Reitter, 1885) syn. nov., A. parvula Jeannel 1962 = A. humidula (Reitter, 1885) syn. nov., A. dicastrii Franz, 1996 = A. bicornis Jeannel, 1962 syn. nov., A. latifrons Raffray, 1904 = A. longiceps (Reitter, 1885) syn. nov. Achilia nigrita Jeannel, 1962 belongs to a different genus and will be treated in forthcoming papers. The remaining ten species are redescribed, and two new species belonging to the A. sinuaticornis group are described: A. fokkata sp. nov. and A. lapsus sp. nov. The lectotypes of A. longiceps (Reitter, 1885), A. convexiceps Raffray, 1904, A. quadraticeps Raffray, 1904, and A. latifrons Raffray, 1904 are designated. For all these species their distribution is detailed and mapped, and habitat/collecting data are summarized.