Dead by Daylight

This achievement requires you to hit another survivor with a survivor you threw after grabbing them with your power as The Mastermind. When you chain hit survivors the 2nd survivor hit will either take damage if they are fully healed or go into deep wounds if they are already injured.

You will receive progress if you receive the scoring event "Collateral Damage". This can be obtained by both slamming two survivors together or throwing one survivor into another.

This achievement is a mixture of skill and luck but weighs heavily on luck since it requires two survivors to be lined up with each other.

The easiest way I have found to gain progress in this is to let survivors unhook in your face. Stand ready with your power and once the unhooked survivor finished their animation and is about to start moving that is when you want to use your power on the savior survivor. If done correctly you will injure the savior survivor and the unhooked survivor will go into deep wounds.

A great place to attempt to get progress is after having a survivor hooked in the basement. The basement is pretty narrow and allows for opportunities to survivor slam.

Some perks which can be helpful in tracking survivors:
Scurge Hook Floods of Rage (Onryo Teachable) - See auras of survivors after a survivor is unhooked from a surge hook.
Biter Murmur- See the auras of survivors near a completed generator.
Territorial Imperative (Huntress Teachable) - Great for seeing the aura of survivors going into the basement.
Barbecue & Chilli (Leatherface Teachable) - See the aura of survivors after hooking another survivor
Lethal Pursuer (Nemesis Teachable) - Allows you to see the auras of survivors at the start of the match and extends the aura reading of other aura reading perks.
Nurses Calling (Nurse Teachable) - See the aura of survivors healing
Tinkerer (Hillbilly Teachable) - When a generator reaches 70% progress you gain the undetectable status effect making it easier to sneak up on survivors.

Repeat this 10 times.