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 'Resilient'
Achieve 'Divine Knock Out!'
Achieve 'Double KOs Gold'
Achieve 'Rebound'
Achieve 'KO Collection Gold'
Achieve 'Victorious Silver'
Achieve 'Victorious Gold'
Achieve 'Destructive'
Achieve 'Traveler’s Tall Tale'
Achieve 'The Penta-Ultimate'
Achieve 'PvE'd'
Achieve 'KO Collection Silver'
Achieve 'Damage Dealer Silver'
Achieve 'Damage Dealer Gold'
Achieve 'Air-Time'