Below is the story walkthrough for Episode 1: 'Faith'. The game-changing decision percentage was based on my last playthrough (10/15/13).
Also, note: many spoilers ahead.
Part 1: Welcome to Fabletown
This achievement is story related and cannot be missed. You will unlock the achievement within 10-15 minutes of gameplay.
There will be a very short introduction where you will then proceed to go to an apartment. And... what happens in the apartment, stays in the apartment. Once you go outside, and...
- More precisely, after Bigby lights the cigar, the achievement will unlock.
- The game-changing decision will be whether or not to give Faith the money.
- 88.6% of players gave Faith their money.
You enter a Tentement -- it's Toad's. (A Book of Fables entry will unlock; see below.)
Toad: Bigby, do you know how much it costs to have a family in glamour?
Your choices -
X... I don't make the rules - "Mr. Toad will remember that" will pop up on the screen
A... Saying nothing
B... Get it fixed
Y... Not my problem
--
You enter on an... unfortunate scene. A few unfortunate obscenities are used, and...
For every option you can choose from, he only gets madder (this is true for most of the dialogue with the Woodsmen)
X... What are you doing here?
A... Say nothing
B... Alright, why'd you hit her?
Y... Everybody calm down!
Woodsman: "What are you gonna f###in' do about it, eh? Get the f### out of my way or you're going to get the axe again."
X... This is your last warning
A... Say nothing
B... You're drunk...
Y... [threaten him]
You then proceed to fight with 'Woody' and it ain't so pretty. He spouts out some inaudibles... they're pretty nasty. You can respond:
X... Say that word again.
A... Say nothing
B... SHUT UP!
Y... Be nice, or I'll I make you wait outside.
Following your dialoge with Woody, talk to the female person that you have rescued whose name is Faith.
X... What happened?
A... Say nothing
B... What are you doing here? - You will be met with the response 'these lips are sealed'
Y... You need to leave
You proceed talking to her and Woody attacks you.
You're now outside, on top of a car and Frog will come and speak to you. The Woodsman is nowhere to be seen.
You talk to Frog; you can be a dick or apologize.
--
Faith comes - she attacks Woody after you meet him again. He has a huge hole in his head. You go talk to her (refer to the game-changing decision of the chapter).
Part 2: Wolf in Sheriffs Clothing
This achievement is story related and cannot be missed. You will unlock the achievement around an hour into gameplay.
After you go up to your apartment following your meeting with Faith, and having an odd dialogue with your pet pig (one of the three 'little' pigs perhaps?), Bigby's love interest 'Snow' will go up to your apartment in the middle of the night. She has something 'startling to tell/show you.' More precisely...
- Once Snow and Bigby walk into the elevator, the achievement will unlock.
- The game-changing decision will be whether or not to tell Beast the 'truth' about Beauty.
- 60.4% of players lied to Beast and said that they hadn't seen Beauty.
Note: not much story-related, relevant dialogue was present.
Part 3: The Long Goodbye
This achievement is story related and cannot be missed. The achievement will unlock with less than two hours of gameplay.
After you exit the elevator, there will be a murder for you to solve. There hasn't been a murder in Fabeltown for quite some time, so this is odd. After the long, drawn-out dialogue, and...
- After Bigby finishes investigating the crime scene of the murder, the achievement will unlock.
- The game-changing decision will be whether or not to help Lawrence or Toad first.
- 76.5% of players went to help Toad before Lawrence
You've gone out and investigated the murder. At this point, there hasn't been much of any important dialogue.
Snow asks why someone did this:
X... Someone brought her here
A... Say nothing
B... This is a message
Y... I don't want to say yet
Part 4: The Frog or the Prince
This achievement is story related and cannot be missed. The achievement will unlock within two hours of gameplay.
Bigby will then proceed to go into Icabod Crain's office - who runs the 'business office'. You will have a conversation with Crain, Snow will get Crain's 'massage' worked out; Bigby will investigate various books on Fable's, and...
- After your decision between Toad or Prince Lawrence is made, the achievement will unlock.
- Spoiler: The game-changing decision is related to the death of Prince Lawrence, or the break-in at Toads. If you go to Toad's, Lawrence dies... if you go to Lawrence's... Toad still lives.
You go to Icabod Crane's office and there's some irrelevant chatter. Then, you talk to a magic mirror (think mirror, mirror on the wall.) Bigby's pissed at the mirror, he says: "Mirror, mirror... you're... able... tell me all about this fable"
The mirror: "See, was that so hard?"
--
Mirror: Of which Fable do you wish to know? (Choose one)
1. Woodsman
2. Snow
3. I don't know her name
4. Bufkin (the green thing)
He goes on about each of them... very interesting if you haven't read Fables, or know nothing of Fairy Tails -- Toad calls - it sounds urgent. You go outside; at this point - you choose.
Part 5: Panic in the Parlours
This achievement is story related and cannot be missed. The achievement will, again, be unlocked within three hours of gameplay.
- Once you leave Toad's and meet Dee and Dum, the achievement will unlock.
- The big 'choice' for this chapter will be who you nominate as your prime suspect, there are five suspects:
- Prince Lawrence - 4% of players suspected him.
- The Woodsman - 17% of players suspected him.
- The Tweedle Brothers - 12% of players suspected him.
- Faith's pimp - 22% of players of players suspected him.
- Bluebeard - 16% of players of players suspected him.
The story is tailored if you go to Lawrence's or Toad's first.
At Toad's, you investigate a break-in. He's mad --- he tries to cover something up. It's pretty interesting, in my opinion.
You go to Lawrence's - he's about dead; you have one attempt to ask him a question:
X... Did you hurt Faith?
A... Say nothing
B...Who did this to you?
Y... Who did this to you?
Part 6: The End of the Game
This achievement is story related and cannot be missed. The achievement will unlock when you complete the game.
You will go to a bar to talk to someone; you'll run into a bit of a problem. After you complete the fight and...
- Once you go back to your condos and the cutscene hits, the achievement will unlock.
- The game-changing decision will be who you arrested after the fight - the Woodsman or the Tweedle brothers.
- 67.7% of players made sure the Tweedle brothers didn't get away.
You go to a bar to talk, but you don't get information and you get attacked.
Now, on to the dialogue... you see Woody.
Woody: "You're out of paper towels." (He notices Bigby; sits down)
--
X... Saved your beer
A... Say nothing
B... Just gonna sit down...
Y... #1 or #2
(If you chose Y...) Bigby: For your sake I hope it was number 2. Otherwise, you're probably s####in' your pants right now.
--
Below is a pretty funny line that I encountered while playing the game.
Bigby: "Gimme a Midas' Gold"
Bartender Lady: "You want a lime?"
X... "Sure" she responds: "I think they have some at a bar down the street."
B... "No" she responds with something like: "Well, I ain't got any"
You have a squabble with the mad patron to your right. You go to Woody.
Woody apologizes for the fighting they have been doing for many years. He explains his actions in regards to the now-deceased Faith. He finishes with justifying his actions in Little Red Riding Hood.
X... What are you talking about?
A... So, this was a robbery?
B... Say nothing
Y... I'm taking you in
He gets mad... the two other people turn into fat monsters.
The other male attacks you and you turn into a wolf.
--
Now comes the game-changing decision.
X... [tear his arm off]
B... [walk away]
(Note: this happened in my story playthrough) You go back to your apartment to find Snow, dead... she had died by the same hand.
You see previews for the next four episodes...
Thanks to centerstrain01 for the video, detailing the many choices you can make:
This achievement is 99% story-related. At the end of the last part of the episode (the bar fight) you can choose to either rip the monster's arm off or leave it. When you are finished with your first playthrough, go in and rewind the story to the last chapter (I recommend using another save file), if you previously chose to rip the monster's arm off, leave it; if you chose to leave it, rip it off.
And congratulations, you have completed Episode One of The Wolf Among Us.