We don't have synonyms for achean yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are achaean, archean and achkan.
(n) :
Alternative spelling of Achaean. [An inhabitant or resident of Achaea, especially a member of an ancient Hellenic tribe that inhabited the region of Achaea.]
(adj) :
Alternative spelling of Achaean. [Of or relating to Achaea or the Achaeans.]
(n) :
Alternative spelling of Achaean. [An inhabitant or resident of Achaea, especially a member of an ancient Hellenic tribe that inhabited the region of Achaea.]
(adj) :
Alternative spelling of Achaean. [Of or relating to Achaea or the Achaeans.]