Shadow Warrior 3: Definitive Edition

Once you obtain the sidekicks they got an upgrade called shocking rounds it’s the second upgrade you can get. Each enemy you hit counts as one towards the achievement hope this helps

Not long after fighting your first Oni Hanma you will enter an arena with multiple of them as well as smaller enemies. If you go to the upper level there is an electric barrel, so gather about 2-3 enemies and then shoot it. You can then reload the checkpoint until you get it.