From Smith's Dictionary of Greek and Roman Biography and Mythology (London, 1880)
ACHA'ICUS, a surname of L. Mummius.
ACHA'ICUS ('Achaikos), a philosopher, who wrote a work on Ethics. His time is unknown. (Diog. Laert. vi. 99 ; Theodor. Grace. affect. cur viii. p. 919, ed. Schulze; Clem. Alex. Srom. iv. p. 496, d.)
An original e-text for everything2. I scanned, OCR'd, formatted, and linked this text - it is not available in any format on any other web site. All Greek words are transliterated into Latin characters.