This achievement is found in the tutorial. It requires you to run an obstacle course in under 25 seconds. As Little 3vil mentions, the AI console to the left of the starting door will need to be activated for the timer to show. You can run the course initially without activating this but there won’t be a timer and the achievement won’t be tracked.
There are some dummies you need to melee along the way but on your subsequent runs they will still be gone. So get rid of those and we can do a fresh run.
UPDATE: CommanderCH has stated you can do this in your first run, you can go straight to the end without destroying the targets.
To restart you need to turn around from the ending, jump across back to where you came from and jump the wall back to the starting area. From there you can restart the course by putting your AI in the door console ( looks similar to where you got the AI from beforehand ) to the right as you enter back through the door.
The video below from myself shows the shortcut to get the par time. There’s a fair amount of leeway in this.
Here is another clip showing how to get back to the starting area if you need to attempt it again.