**This achievement is MISSABLE**
Playing as The Deathslinger, down survivors 30 times, while they are hooked on your spear.
NOTE:
It does not have to be different survivors. You can farm a single survivor.
You need to DOWN the survivor. You do not get progress just from hitting them from Healthy -> Injured.
If you hook a survivor on the other side of a window, you can reel them in, close to the window and hit them with a lunge-attack.