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