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