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The fastest way to earn this achievement is by fully upgrading the Stun Gun. You have the opportunity to receive it during the start of Mission 1, or you can hack into the weapons locker at TF29 to get one. There is no penalty for hacking into the weapons locker...you work there after all.

It'll take around 550 crafting materials to upgrade the ammo capacity, and you will need a laser sight attachment as well. This attachment can be bought from the weapons vendor in Jensen's apartment complex or found through open world exploration.

Once you have the necessary materials, open your inventory and tap [ Register or Signin to view external links. ] twice while hovering over the Stun Gun to customize it. Attach the laser sight, upgrade the ammo capacity three times, and the achievement will unlock.