While playing as the Americans, you will encounter Banzai soldiers. They are covered in leaves and charge towards you with a bayonet, you can easily recognise them as they shout “BANZAI” when they come out of hiding. Rather than shooting them, let one of them approach you. You will be forced on to the ground and the Banzai soldier will attempt to stick his bayonet into your chest. When the instruction pops up, quickly click the , you will kill the Banzai soldier instead of him killing you and the achievement will unlock.