The holy, glorious, all-laudable Apostle Achaicus (also Achaikos or Achikos) of the Seventy is commemorated by the Church on June 15 with Fortunatus and Stephen, and on January 4 with the Seventy.
St. Achaicus is mentioned by St. Paul in I Corinthians 16:17, saying, "I am glad of the coming of Fortunatus and Achaicus: for that which was lacking on your part they have supplied. For they have refreshed my spirit, and yours."
Troparion (Tone 3) 
Kontakion (Tone 4)
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