Here is the full list of all 19 Divine Knockout (DKO) achievements.
Achieve 'Practice Makes Perfect'
Achieve 'Rebound'
Achieve 'The Penta-Ultimate'
Achieve 'Air-Time'
Achieve 'Victorious Gold'
Achieve 'Resilient'
Achieve 'PvE'd'
Achieve 'Divine Knock Out!'
Achieve 'Triple KOs Silver'
Achieve 'Triple KOs Gold'
Achieve 'Double KOs Silver'
Achieve 'Double KOs Gold'
Achieve 'KO Collection Silver'
Achieve 'KO Collection Gold'
Achieve 'Victorious Silver'
Achieve 'Destructive'
Achieve 'Traveler’s Tall Tale'
Achieve 'Damage Dealer Silver'
Achieve 'Damage Dealer Gold'