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