Here is the full list of all 20 HAYAI achievements.
Achieve "Black Belt" on Tomoe
Achieve "Survivor" on Tomoe
Achieve "Combo Master" on Kazuya
Achieve "Survivor" on Kazuya
Achieve "Black Belt" on Kazuya
Achieve "Sensei" on Kazuya
Achieve "Combo Master" on Hideyoshi
Achieve "Survivor" on Hideyoshi
Achieve "Black Belt" on Hideyoshi
Achieve "Sensei" on Hideyoshi
Achieve "Combo Master" on Masashige
Achieve "Survivor" on Masashige
Achieve "Black Belt" on Masashige
Achieve "Sensei" on Masashige
Achieve "Combo Master" on Oda
Achieve "Survivor" on Oda
Achieve "Black Belt" on Oda
Achieve "Sensei" on Oda
Achieve "Combo Master" on Tomoe
Achieve "Sensei" on Tomoe