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