DOOM

Edit April 2 2022:
There seems to be an issue with the search function in SnapMap at the moment. Personally I haven't used it in a very long time and I don't recall how it used to work, because I had trouble figuring out how it worked for a minute or two.

If you enter the map's ID "KFADVXVW" then move the cursor down to "SEARCH >" and hit , the game doesn't seem to do anything but show a little red box on the right with the same ID in it. If you simply hit again you'll see the map listed, the "One stop achievement shop" which seems to be still searchable and playable.

Some are reporting issues where the Doom servers are indicating there is no connection which has been somewhat of a theme going back several years. The only thing I can recommend if this is occurring is to try again later or the next day, since they seem pretty good about getting the servers back up.

Original solution:
I have created a SnapMap as a one-stop shop for several achievements, including this one. To find it, simply hit to open the search function from any tab in the SnapMap mode and search for "KFADVXWV" (the capitalization does not matter.) Once you locate the map, make sure you hit to "Play" the map, because "Save to my downloaded maps" will not count if you launch it from your downloaded maps.

Setting the lobby type to private does not void this achievement.

If you follow the short tutorial texts on the screen, you can continue into a small arena and use buttons on your controller to spawn demons. You are (nearly) invincible, have infinite ammo, and permanent quad damage once you enter the arena part of the map.

For this achievement, hold to access the weapon wheel and select the chainsaw. You can then either hit to spawn some hapless zombie enemies who won't fight back, or hit to make it a little more interesting to chainsaw hell barons instead. You can hit the spawner buttons as many times as you like, but the game will only allow 12 demons on the screen at any one time.

If you still need to complete 200 glory kills for the Butcher achievement, just keep chainsawing enemies until it pops. A chainsaw kill counts as a glory kill.

This map is also great for:

Solution for Timing is Everything In DOOM
Solution for Juicin' It Up In DOOM
Solution for No Rest for the Living In DOOM
Solution for Butcher In DOOM

You can pick this achievement up quite early in the game. You pick the chainsaw up at around the start of the game and it isn't missable so you dont need to worry about it. Around 2/3 of the way through mission 2, you will at some point open an airlock to let you enter the outdoors. You will know this due to it being the only part in the entire mission that will allow you to do this. You will press a button in the building which opens the door to an airlock near where you pick up the chaingun which then you walk into to press the button and opens the doors to the outside. As soon as the doors open, enemies will swarm you with about 10-13 spawning in. If you pull out your chainsaw by pressing and start mowing the closest ones down to you. Once you have run out of fuel, there are 2 tanks of fuel that if you use it all up, they will boost you up to full. There will be one at the opening doors straight in front that you can't really miss and another down below on a platform to your left around 3/4 across it. If you already had full fuel in the chainsaw, you can pick up 9 kills with it in this area. If not it will be 9 or less depending on how much you already had. Once done this, pause the game and go to 'last checkpoint'. This should take you to the opening of the airlock and you should just be able to rinse and repeat like I did.