Here is the full list of all 18 Karate Master 2 Knock Down Blow achievements.
Defeat Oboro.
Defeat the bear.
Defeat the bull.
Requires tai kitae 10
Requires KI 10
Requires speed 10
Requires toughness 10
You need to earn 1500 bucks.
Requires strength 10
Win the Kumite tournament.
Win a ring event.
Defeat the legendary Sensei Matsu.
Jump over a car.
Reach fame 100.
Win a Karate-Pro tournament.
Win a Bogu Kumite Tournament.
Heal yourself in the hospital.
Win a Full Contact Karate tournament.