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