Note: This achievement may not unlock on the first several attempts. You may also try and succeed doing this several times without the achievement unlocking.
Once you get to the wedding reception in Riverbank you will see several rows of plastic chairs. Your goal will be to spawn as the Charger and run through eight chairs with a survivor in hand. This is the hardest achievement to pull off within the DLC so a lot of patience is required.
If you are playing with friends, have them stand in front of the chairs and charge at them. If you want to attempt this on your own with two controllers, you can with great difficulty. Set up the survivors in front of the chairs and then use the target controller account to earn the achievement by charging one of the survivors though the chairs.
Make sure you line up with the row of chairs on the ground and not the stack of chairs to the left. Charging into the stack of chairs won't earn you the achievement as they're just static objects.
This can be done in any of the team-based game modes. The method in the video below is using Scavenge Mode as you start close to the wedding reception. You can call a vote until your main account starts as the Charger. If you do attempt this in Scavenge make sure you collect a gas can just in case you run into overtime.