Im still thinking, "old greek" is a very big branch, you have Byzantium Greek, Mycenaean Greek, Dorian Greek, Macedonian Greek. If I translate myself I maybe can get it as far to Byzantium Greek, but often you can also find a lot of ancient names on google, I will look for you later.
Sorry that im asking it so much, but which city are you going to give to the Achaeans? Maybe you can give them magna graecia or another town in greece?
Otherwise you have to recruit them for the Mycenaean, then I need to update the roster, I maybe already want to add some units to the roster for mycenaean like Thessalian Warriors.