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