First of all choose lone wolf you will gain an extra amount of life and choose the character Big Mama (Milfs are always the best choices hahaha) this is because her punch attack is bigger and the trick to accumulate more points is always kill the enemies with the melee attack when you do this the enemies ill drop diamonds each diamond is worth 30000 points, best route to focus on this achievement is the jungle route if it is written in Japanese choose the middle option, doing all this when you are in the middle of the second stage or before You have already achieved this achievement.