This guide is to help anyone to try and get the Boatbuilder Legendary achievement. There is such a narrow window of days if you make even a tiny mistake it can knock you off the 2 month mark.

Managing your resources is key. Avoid any road blocks and manage your buildings resource exports.

Here is what my game looked like at day 15
Start with the buildings in the south.
Set out 2 lumberjack huts, a well, 4 houses and a sheep farm.
Set one of the lumberjacks as priority to get it built first then deprioritise.
Set your well and sheep farm export list to target the houses.
Set your houses to target the lumberjack huts.

Once you have those 8 buildings built, its time to start expanding.
Start with a third lumberjack and 2 forestrys.
Add the new lumberjack to the houses export list.

After that you can move on to stone. Build your roads up to the stone area and start the second area.
You'll likely need to set your lumberjacks to clear a couple of trees for your sheep farm.
Start with a sheep farm, 2 houses, a well and a stonecutter.
Once those are built add the 2 other houses and a second stonecutter.
Remember to set the export lists for this area:
Well and sheep farm to target these new houses
New houses target the stonecutters

A bunch of trees should be clear now for the third forestry.

Congratulations! you have all your base production set up.
the export lists stop traffic from building up across your colony so resources get transferred faster and buildings supply things closer to them.

Its almost time for the main event. First build yourself a sawmill. Then finally a Workshop.
while the workshop is building, add it to the export list of two houses from each side.
Make sure you are starting research before the 1 month mark! any later and you wont have time
Order I used for research:

• Stonemasonry
  
• Scaffolding
  
• Construction
  
• Boatbuilding

While the research is happening, I work on expanding with watchtowers to the shore. 2 is all you need.
Once the wood is in good supply build a second sawmill, you'll need the planks

My layout at about 1 month and a day

the storage yards are for the boatyard, all you need is 8 stone in one and all the planks in the other.
I recommend you don't start storing until you're mostly through the research or they will go back and forth to the workshop.

Why 8 stone?
Once the research is done you can dismantle your workshop for the 4 extra stone you need for the boatyard.
I also recommend dismantling all stonecutter buildings and houses for the boost in wood once you have enough stone.

It might take a couple of tries but this guide should help you get that achievement.