For this achievement you must have a cyberware implant that slows down time equipped so that you can kill an enemy while time is slowed.Method 1:
The cheapest cyberware implant that slows down time is a nervous system implant called “Kerenzikov” which costs $5000
at a Ripperdoc (scissors icon on the map).
* Kerenzikov allows you to aim and shoot while dodging. Slows time by 50 percent for 1.5 sec. when blocking, aiming or attacking during a slide or dodge. Cooldown 5 sec.
I used the Ripperdoc in Japantown to purchase this implant.Method:
Weaken enemies by shooting them until their health is low. While sprinting press
to slide then quickly hold
to aim and slow down time for a short time. You must kill the enemy in this short time window. Shotguns, revolvers and pistols work best. Kill 50 enemies like this and the achievement will unlock.This is a video of how it is done:
Some other nervous system implants that slow down time can be seen in the image below:
You can purchase the “Dynalar Sandevistan MK. 1”
operating system which costs $7500
from the western most Ripperdoc in Northside, Watson. To equip this item, you need 6 Reflexes.
* Dynalar Sandevistan MK. 1 slows time by 50% for 8 sec. (Cooldown 30 sec.). Increases any damage dealt by 5 percent when Sandevistan is active. Activated by holding .
Once you have it equipped, find a group of enemies (story missions, side missions, around the open world or police), activate it to slow down time and kill enemies while time is slowed.