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