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