Double Dragon
12 Achievements
200
2-3h
Xbox 360
No Mercy
Take out all the enemies before the final boss in a single player game.
15
How to unlock the No Mercy achievement in Double Dragon - Definitive Guide
Rocket, x360a
To get this, you must take out the guys wearing green and all other enemies before you kill the main boss. Do not let any of them walk thru the door. Easiest when you utilize the 
+
elbow combo. You can die and continue as many times as necessary for this achievement to unlock.
