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