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This achievement can be earned at any time during your playthrough after Mission 3. Please keep in mind combat-related achievements only work on enemies in a hostile environment; civilians and policemen do not count.

You will need to unlock and fully upgrade the "Tesla" augmentation.

Similar to the other combat-related achievements, this is best done in the underground Russian casino. Once you enter, head upstairs and turn around so you're facing the casino floor. Using whatever weapon you have at hand, shoot the thug on the upper floor to your left to get the mobsters riled up, then activate your Tesla aug by holding the button you assigned it to. It will begin to charge and automatically lock onto four of the enemies on the ground below. Fire the Tesla shot away and it will incapacitate four of the mobsters and unlock the achievement.