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