Left 4 Dead 2

This one is a little more tricky than you might think, especially if you do not have a group of four.
You have to go through Capter 2: Sugar Mill in the Hard Rain campaign. Even though you backtrack through all this, you only have to do this one level. Having at least one partner on this one makes it a great deal easier and just to make sure that your AI teamates dont trigger a witch, switch the difficulty to expert and kill them off, then switch back to easy. (Do this every time they come back just to make certain they dont spawn at an inoppurtune time.) Try to have at least one person with a melee weapon at all times just so you dont hit a witch randomly.
Chargers and Smokers are your worst enemies here as they can ram/pull you into a witches area. Turn your subtitles on and whenever they are "heard" stay back until you can see them and kill them. Try to only throw your pipebombs and molotovs into areas you KNOW there are no witches as a close explosion will trigger her. Now, if a witch kills one of your players that is ok, as long as you do not kill her, your are alright. So you may be able to get really lucky and just book through an adrenaline.
The biggest problem area for people trying to sneak through is the small cornfield. The easiest way is to walk on top of the pipe through the middle of the field and stop as soon as you exit the field to look around as there is usually a witch or two right outside the final building. Any questions or specifics you need help with, comment.

Although everyone says this is hard with bots, I beg to differ it's just a matter of controlling them.

What I did was when I got to the first section of where the witches first appear I got my melee weapon out like others have stated.

Next I made sure of where the witches were and tried to identify what were good routes to take. Now when I got near one and knew where I was going, I ran as fast as I could around the witch and tried to put as much distance between me and the witch as possible. Because I ran so quickly, My bots were following me and didn't go near any witch. They will always follow you so try to run far enough for you to see where the next witch is and the bots won't be able to startle any witch. Just keep trying if it doesn't work out but if you go through it witch by witch it should be a cake walk.

btw I did it on easy as I got it on my first play through of the 5 campaigns.

Guide courtesy to Achievement Hunters/RoosterTeeth. He plays with players and you should do that to because sometimes one of the bots will just walk up to them and stand there for a couple seconds and startle her...so then you gotta restart.

Start chapter 2 of the Hard Rain campaign. It's good to have atleast one buddy with you while doing this. Run through the chapter staying clear of witches and other special infected especially jockeys as they steer you straight into witches pick off any infected you see before entering a small area (this makes it easier to run past witches without being slowed down) If you happen to find a defib unit take it because if a survivor does startle a witch you will need to let them die and you will be able to revive them

Just got this on my second try playing with 3 bots. Just keep you speed, running and try not to ever stand still. The only two times I killed zombies was in the beginning and waiting for the elevator.

Adrenaline will help alot during the cornfield, the first time I tried i ran into a Witch in the cornfield, I did this on my second try as well but was able to outrun her with the adrenaline. My Bots were perfect during these runs, so keep you speed and they won't have time to shoot at any witch. You don't have to wait for your bots in the saferoom or close the door, you get the achievement as soon as you walk into the room.

I walked into the room, got the achievement then walked out again and killed a witch.

You do not have to play the whole campaign for this, just start a game on the second chapter of Hard Rain (Sugar Mill) on the easy difficulty. I did it with friends but it would be easier to do it with a full game and no bots, just in case Rochelle decides to heal you when a Witch is walking towards you (past experience).
When at the elevator crescendo, make sure you have pipe bombs or boomer biles, when at the corn field, this part is luck. Just run through and hope you don't run into a Witch. Just get to the saferoom in the diner and the achievement is yours.

I tried different ways to get this offline. The easiest way was put CCR Fortunate son on youtube and make it loud.

(put the game on easy)

The next step is abandon carefulness besides going around witches when you have too.

Try to outrun your bots the best you can. Run run and run, I guess if you are so far ahead of them the witches don't register your IA turret teammates.

When you hit the corn field replay CCR Fortunate son and fallow the pipeline. When you see the gas station stop and check for withes, re-just and run into the building and find the saferoom. This was super easy doing it this way completely drunk.

Now you should have heard the ding of this thing unlocking, put on youtube rolling stones - paint it black, and have a smoke!

SOB STORY - 30G (Original Achievement)

Difficulty: Easy

Estimated Period of Time: Short
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To get this Achievement, you must get through the Sugar Mill without alerting a Witch.

This may be easier with other players, depending on your point of view, but is easily done solo as well.

First, load up Single Player and the Hard Rain Campaign. Go to your Settings and change the level to Easy, and Chapter 2: Sugar Mill. Now start the game.

Once in the level, try to resort to only melee weapons and avoid shooting at random or you might hit a witch on accident.

Witches are women who either sit on the ground or wander around while crying. Their crying is very distinct and you'll know they are nearby when you hear it. If you shoot them, shine your flashlight on them, or just get too close to them for too long, they will become alerted and chase after whoever alerted them. (This will show on screen to let you know). If this happens, restart the level.

Your goal is to get through the plant, into the multilevel building, down the elevator at the top, across the corn? field, and into the gas station safe room without ever alerting one witch.

MODE:

It’s much easier to load the section directly, it should be on Hard Rain 2: Sugar Mill. It’s quicker than having to complete the first part.

If you are wanting to do this solo, and the bots are startling the witch, you can do this on the “Last man on earth” mutation, which leaves you as the only survivor.

The other option is to change the difficulty to advanced once you get to the fields, kill as many AI as you want then change it back to easy. Note, not 100% sure the second method works, didn’t get to try it, but I doubt there are systems in place to stop you from doing this. If you do this, probably keep 1 AI around so that you don’t insta-fail if a random jockey manages to catch you.

Keep in mind this will increase the difficulty of making it through alive. So if you have 4 friends capable of joining up, just do a regular campaign. If you have 2 or 3, it’s probably best to kill the remaining AIs.

A lot of the time, it comes to luck based on the spawns of the witches. I’ve heard that there one person has ran into 24 witches, but I managed to complete it on LMoE while only seeing 6-7 in total and 3 in the last field.


STRATEGY:

The best way to complete this would be to use both audio and visuals to help you. Headphones work best. This way if you know how close you are to a witch based on the intensity of the crying, and once you get dangerously close you can instantly be warned. Take your time if needed, and step back when needed.