To make Things easier to understand, i show you how i approached this Guide and how i gathered the different Informations. (Cause i already encountered the first "doubters"^^)
I'll edit the last Chapter into the Information, for who is interested.

Hope the Guide helps you guys :-)

• Unlocked after speaking the first Time with a Wild Animal
  
• Unlocked automatically on the 6th of Spring
  
  

• Righ highest attunement with your first ridable Animal
  
• Automatically unlock when reachin 15k Village Prosperity
  
  
  
  
  

• Reach highest Attunement with a wild Animal

• Reach 67k Village Prosperity
  
  
  

• Harvest your first Sunflowers in Summer

• Reach high enough Friendship with an Animal to breed it

• Reach 64k Village Prosperity
  
  

• Developed Sundial
  
• Reach 87k Village Prosperity

• Developed Brewing and Cheese Cloth
  
• Reach 228k Village Prosperity
  
  

• Reach 56k Village Prosperity
  
• Need to tame an Animal which you can milk (Female Ibex)

• Unlocked automatically after upgrading to a LargeHut
  
• (Minimum Village Prosperity requirement, needs to be measured)

• Unlocked automatically after upgrading to a Medium Hut
  
• (Minimum Village Prosperity requirement, needs to be measured)
  
• "Developed "Art Station" to fulfill the "Pot" Requirement
  
  

• Obtain your first 2 Animal Products after Taming an Animal
  
• (only Minimum Village Prosperity requirement, needs to be measured)

• Reach 35k Village Prosperity
  
  

• Have at least 8 fully Grown Animals of the Species "Ibex" or "Boar"
  
• Obtained your first Obsidian
  
• Reach 71k Village Prosperity

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• Obtain your first Copper

• Catch 40 Fish in Total
  
• Get your first Hardwood
  
  

• Developed Smelting and Spindle Whorl
  
• Reach 155k Village Prosperity

• Reach 30k Village Prosperity
  
  
  

• Obtain your first Obsidian

• Developed Brewing and Fermenting
  
• Reach 158k Village Prosperity
  
  

• Finish the Quest "The First to Farm" (Harvest 4 Crops)

• Reach 25k Village Prosperity
  
  

• Obtain your first Tin

• Need to tame an Animal which you can shear (Boar/Bison/Guanaco)
  
• Reach 135k Village Prosperity
  
  

• Reach 13k Village Prosperity
  
  
  

• Unlocked automatically on the 2nd of Summer
  
  

• Developed Smelting
  
• Reach 240k Village Prosperity

• Be at least on your second Day
  
• Refill your Waterskin
  
  

First thing i did, was to make a new Save, talked with Nobody and slept for 2 Years straight.
I wanted to rule out every possibility that an Idea is tied to a Time Requirement.
What i discovered what, that a few Technologies are getting automatically unlocked.
What irritated me, was that i've gotten these Unlocks on my normal Playthroughs at an earlier Time.
I wrote these Days down.
After that i started a new Save and wanted to target one Smoke Signal after another and gave me 100k Contribution Points to make things easier, at this time ive unlocked a few Smoke Signals on the 2nd of Spring.
The Same ones which got "automatically" unlocked, for example the Press, Sundial or Mortar and Pestle.
I gave myself 500k Contribution Points and unlocked even more.

At this Moment i knew that Smoke Signals are tied to Village Prosperity aswell.
Luckely for me i wrote down the Days on the 2 Year Sleeping Save. And on this Safe, the Village contributed 1k Prosperity Daily for 2 Years straight, so on the 25th of Spring where i unlocked the Press i had 25k Prosperity.
I Double checked it and made a new save, gave me 23k Prosperity > no Press > 24k > no Press 25k >Press unlocked.
This Discovery ruled out a few Smoke Signals, which i was happy with.

I wondered why i've gotten 1k Clan Contribution Daily on the one Save, but on my Normal Playthroughs the Contribution was definitely higher.
It was easy to find out, on a another Save i talked with Villagers and saw a higher Contribution then 1k the following night > Bonus Discovery = Clan Contribution is tied to your Friendship with the Members

I used the 500k Contribution Save and played the Game "normaly" on Days where i could finish a quest i made a Backup Save.
For Example:
i finished Brewing > Nothing Happenend > Finished Press > nothing Happened > Finished Mortar > nothing Happened > Finished Fermenter > Smoke Signal for Vinegar Pickling showed up.
Reloaded the Save: Finished Fermenter > nothing Happened > Finished Brewing > Smoke Signal for Vinegar Pickling showed up.

So i knew Vinegar Pickling is tied to "Brewing" and "Fermenting"
Again i made a new Save, played it normaly (with a a lot Backups) >
Developed Brewing and Fermenting as fast as possible > No Vinegar Pickling Smoke Signal > Backed up the Save > wrote down Prosperity > Gave me 50k more > nothing happened > Backup Save > gave me 50k more > Smoke Signal for Vinegar Pickling showed up > reload Save > slept every night (1k Prosperity every night) wrote down daily Prosperity > Reached 158k Prosperity > Smoke Signal for Vinegar Pickling showed up.

Reloaded the first Backup Save > Gave me 156k Prosperity > Nothing Happened > Slept for 2 Days, hit 158k Prosperity > Vinegar Pickling showed up.

At this Time i had a definitive Answer for Vinegar Pickling, yippie ^^

I Repeated this Process for nearly all Smoke Signals.

It may look "easy" to look at Irrigation and see: Smelting and Spindle Whirl is needed, but the detailed reality is something like this:

• Reach Day 4 to unlock the Mine
  
• Harvest your first Root-Crop and clear the Owl Totem
  
• Get the Flintaxe and progress deeper into the Mines.
  
• Obtain your first Obsidian, craft the Obsidian Axe to progress even further into the Mines
  
• Reach 25k Village Prosperity for the Press
  
• Reach 30k Village Prosperity for the Mortar and Pestle
  
• Reach 35k Village Prosperity for the Fermenter
  
• Clear the Monkey Totem
  
• Get your first Copper and with it the Copper Sickle to progress in the Mines
  
• Reach 56k Village Prosperity and tame your first Female Milkable Animal for Cheese Cloth
  
• Reach 64k Village Prosperity for the Brewer
  
• Harvest your first Sunflower to start developing Honey or reach the 2nd of Sommer and develop Trading with Zelk, to trade with Zeda for Honey
  
• Clear the Bear Totem and get your first Tin
  
• Develop Smelting (First Requirement)
  
• Reach 135k Village Prosperity and tame your first shearable Animal for Spindle Whorl (Second Requirement)
  
• Reach 155k Village Prosperity and develop Irrigation (DONE)