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