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