This is a challenge for most knife kill Accolades. That means you get the award for most knife kills in a match.
Alll you need to do is play any game mode and get the most knife kills!
We only need 10, and just to give you an idea of how easy this is...
The first challenge we ended up getting 69 out of 10, even though it says we only got 40.
The second challenge we got 110 out of 10, even though it says we only got 69