There are 7 Achievements for completing the days. Just don't run out of health or sanity and keep the chaos level from maxing out. The easiest way i found to do this was using a Mysticism/Monarchy/Sociopath build, concluding the interrogations immediately and taking free meat from the grocer everyday. Sell all your corpse to the Slaughterhouse and purchase the axe upgrades from Nails at the start.

Day #2
Still alive on second day


Day #3
Still alive on third day


Day #4
Still alive on fourth day


Day #5
Still alive on fifth day


Day #6
Still alive on sixth day


Day #7
Still alive on seventh day


Day #8
Still alive on eighth day

Milgram 12
You refused to torture the Scribe
On day 2 after the execution of your Father choose to complete the tutorial and continue the tutorial until the "conclude" option appears (after you have denied the Scribe rest twice). Select "conclude" and then "back" until the text stops changing and ends in "Son, you don't have a choice. You have to continue." Then select the conclude option again to end the interrogation.
Milgram 23
The Scribe survived your interrogation.
On day 2 after the execution of your Father choose to complete the tutorial and continue the tutorial until the "conclude" option appears (after you have denied the Scribe rest twice) then click conclude again without going back.

Milgram 65
The Scribe died in your torture chamber
Keep following the prompts until the end of the tutorial, he will eventually end up dead.

No one is innocent
The Orphan was tortured.
Conduct the interrogation yourself, do not let your assistant do it.


Purifying flame
The Orphan was executed
Do not kill the orphan during the interrogation then burn her in the palace square.

Young wife
You married the Orphan
Have stats in Monarchy and take the skill "Right to Mercy". Conduct the interrogation yourself,and the conclude the interrogation without torturing her, when you go to execute her a new prompt will appear right to marriage.

Bluebeard
The Orphan was murdered.
First sell a body to the Slaughterhouse and chose to conduct the experiment again, then you will need to marry the orphan, (see "Young Wife" achievement) and you will need Sociopathy stat. Show her you are not angry when she messes your house. When the holy man visits you refuse to hand her over, she will destroy your house and you will have the option to murder her for the experiment.

Welcome to the family
The Orphan's body was buried.
Either after the execution or murdered (see Bluebeard achievement" take her to the New Cemetery and bury her.

Family dinner
Had dinner with the Orphan.
You will need Humanity stat and having Monarchy stat is recommended so that you can take free meat every day from the grocer in the market everyday as it is needed to get the prompts, so take "Right to Food" and "Right to Mercy" skills.
You will need to marry the orphan, (see "Young Wife" achievement) and have some fresh meat. Once she burns dinner do not scold the child and go to bed on an empty stomach. A few nights later the priest will come to your house, invite him in and decline giving the child back and threaten him with violence. The next night "tell her to sit down" then "praise the food".

Parricide
Executed Father yourself
Accept the Kings offer then "Do it yourself".

Tradition
The Father's body was buried
Once you reclaim your fathers body from the Judge take it to the New Cemetery and bury the body.

A faithful son
Your Father was executed by the Assistant
Accept the Kings offer then "Pass the axe to the assistant"

Skeletons in the closet
You uncovered a family secret
Do not sell your Fathers corpse once you recover it from the Judge. Hold onto it until you have full upgraded your house by keeping everything the way it was.Renew the picture,get the books on dads recommended reading list,keep dads room with the closet,leave the storage as grandmas room get the barrels for the water .Then bury your Father in the New Cemetery and you will be prompted a new dialogue.

Best friend
The Dog was tamed
Do not sell the rope from the Gamekeeper's execution.Trap the dog in the pit, go down into the pit and select "Tame the dog"

Best dead friend
The Dog was killed
Trap the dog in the pit, go down into the pit and select "Kill the dog"

Save the drama
Fed your Father to the Dog.
Do not visit the ruins to track the dog until you have your fathers corpse from the Judge. Once you have the corpse visit the ruins and select the option "Make some bait out of a piece of your Father's body".

Landlord
Took the Maid's house
Do not sell the Gamekeeper's body to anybody, when the maid visits she will offer a trade, accept the trade and then visit the Old Cemetery and have a funeral for the Gamekeeper.
Death from alcoholism
The Gamekeeper's Brother was executed
On day 8 complete the conflict then conclude the interrogation. proceed to the execution.

Worse than death
You let the Gamekeeper's Brother go
On day 8 take the maid with you, after the conflict you with go to execute him, select "Ask her sardonically if you should let her uncle go"then "set the Gamekeeper's Brother go"
Helping hand
The Maid was inspired
Choose to execute the with the Gatekeepers Brother, there will be dialogue with the maid. Choose "Help her get through it" then "comfort her by saying..."
The weakest link
The Maid was broken
Choose to execute the with the Gatekeepers Brother, there will be dialogue with the maid. Choose "break her into submission"then "tell her there's no meaning"

I had a choice
Executed on King's orders
When prompted on Day 2 at the Palace square refuse the King and then either recommend the assistant or dont (it doesnt make a difference) then "say nothing despite the tradition".
First case
The Gamekeeper was executed
Conclude the interrogation then execute the Gamekeeper.

Thirst for knowledge
Visited the Surgeon's anatomical theater
Take a body to the Slaughterhouse to sell and choose to stay and learn more.

The Murderer
You murdered a person
See "The God"

The Conqueror
You murdered 10 people
See "The God"

The God
You murdered 20 people
You will obtain this through normal progression, its a cumulative kill count.

Knee-deep
You worked as nightman 1 time
See"Submerged"

Neck-deep
You worked as nightman 5 times
See"Submerged"

Submerged
You worked as nightman 10 times
Once the main story line has been completed for the day,you will have spare time at the end of each day to do optional tasks. Just go to Plague lake and choose to work 10 times.
The bar is closed
The Tavern Servant was killed.
On day 5 you will visit a tavern in the slums, make sure you are successful during the confilct and you will be allowed to interrogate the Tavern Servant, Then just kill him, reconmmended to have sociopathy skills "Cruelty" and "Master of Pain".
In debt
You become the Shepherd's debtor
On day 6 you will enter the Catacombs, do not pay the guards and kill Shepard's men.

I'm not locked in here with you...
The Elder was tortured
On day 7 you will go to the Slaughterhouse, choose the attack the Elder to interrogate him.

A real gentleman
The Maid's blood was taken
On day 7 you will go to the Slaughterhouse, choose to get blood from the maid. travel to Leech End and hit the maid to obtain her blood.

Neophyte
Learned an occult ritual
Sell a corpse to the Old Cemetery and complete the ritual.

Acolyte
Passed occult initiation
You will need to have learned the skill "" to make a hand of glory and have sold two bodies at the Old Cemetery in order to start the Ritual. then choose options "It was your desciple..."(top). "He was doomed...". (bottom) After Dusk(middle). light the hand of glory and select the thumb and little finger.


Gladiator
Fought on the Arena
Get into debt with Shepard, by attacking the guards in the Catacombs, then pay the debt then fight in the arena.

My palace
You completed all of the house upgrades
Everyday you will be able to upgrade your house. The best way to do this is be greedy with your money. Always sell all your bodies to the Slaughterhouse, never give your money to the assistant. be sure to pick up the 300 coins from the duke after you encounter him with the maid and again when accept the pay off when you visit his residence.(by selecting the correct dialogue). buy the clock and horse first to give you more time to work as well.
Educated
You read a book
"See Erudite"

Erudite
You read all the books
Visit the Dukes residence read all of the books in the library. 2 books in each category, 6 in total and will take 12 in time. (2 per book).

Coup de grace
You killed the Surgeon's aide
Visit the Slaughterhouse with on the way our the Elder will ask you to kill the Aid in the back of a cart.
Not really sure what the prerequisites for this are. I recommended the assistant and closed my eyes for the execution. basically Choose options/stats that are blue/blue/blue and be kind to your assistant. let him eat etc and do not interfer with the butchers and arena figher quarel. after you sell the coprse to the slaugherhouse, conduct the experiment and read the book, when you leave the elder should approach you and then you just need to go to the cart and cut the aides throat. take both humanity skills and right to food before you sell the body to them.

Old reliable method
Took a part in the cannibal cultists' rite.
Have Red/Blue/Red stats and on day 7 collect the blood from the Maid and choose to take part in the ritual, then visit the bridge to take part.

Catacomb explorer
You found a secret passage in the Catacombs
So first you will need a hand of glory, so you need to sell a body to the Old Cemetery. You will then need a second body to cut fat from the body to light it in the passage on day 6 to initiate the dialogue when entering the catacombs. I dont know if equip the hand and fat is esstienal but I did it anyway. I also cut eyes from both my farthers body and servants to see the visions before completing the ritual (see "Acolyte")

John Needham
The worm quest ended in favor of occultism.
Upgrade your house to provide a coldstore, next sell a body to the slaughterhouse and choose to conduct the experiment again. When you murder someone there will be a prompt to use the body for the experiment. The next day you can visit your house and in the diary there will be a prompt to check the body. visit the New Cemetery and then continue the dialogue.

Lazzaro Spallanzani
The worm quest ended in favor of science.

Currently unobtainable? I have personally spent over 25 hours trying to get this one, if you know how let me know and I will update the guide.