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