There are 2 ways to obtain this achievement: the hard way or using a glitch. The choice is yours.
* The hard way: You need to take out the enemies with the combo successfully executed (LT,RT,LT).
* Glitch:
First of all remove the update that fixed the glitch. Without the update, you just can kick the guys and the achievement will unlock. Afterwards do the update otherwise the achievement of confusing enemies with the bible will NOT unlock.