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 'Rebound'
Achieve 'Double KOs Gold'
Achieve 'Victorious Gold'
Achieve 'Divine Knock Out!'
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 'Resilient'
Achieve 'Air-Time'
Achieve 'PvE'd'