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