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