The Chainsaw Deathmatch is now a year-round Plaza minigame event that occurs consistently throughout the day. Hang out enough on the plaza and you will eventually get a prompt that this minigame is occurring. From there, it's just chainsaw time.
This achievement is definitely more of a grind (no pun intended) than a challenge, but there are tricks to make it go faster:
- Crouching enables you to be in contact with a firmer hitbox when you're next to someone
- People respawn at certain fixed points in the map that change depending on what state the arena is in
- You only get credit for a kill if you get the entire kill. Assists do not count. Environmental kills do not count.