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