Its important to select the buildings with the highest income. This is the items i had built at the time the achievement popped.
- Woodcutter's camp
- Bridge and Road
- Forge (i selected armorsmith)
After you have built everything you need, you can recruit certain people to join the city, to maximize your daily earnings. Not all of them are needed for the achievement, but i list all you can recruit for maximum daily Groschen. Also an underpaid locator helps.
Mirka for the tavern. She's at the windmill near Talmberg/Merhojed. You first meet her during the "My friend Timmy" quest
Raspberry for woodcutting. You might come across him during the "On the scent" quest while looking for Reeky. He's at the woodcutter's camp SW of Inn in the Glade
Kunesh for woodcutting. One of the first NPC's you come across in the game. Kunesh can be found at random places in Rattay and can be recruited after finishing the "Scavenger" quest
Kornelius for the trader. Encountered during the "Aquarius" quest in Rattay. You'll find him at various places in Rattay.
Adam for the tavern. Doing the quest "Besmirched" will cause you to come across the potential tavern owner. Adam can be located helping out at the inn closest to the western exit of Rattay.
Zach or Master Ota for the armorsmith. You'll meet both of these during the "All that glisters/Rattled" quest in Sasau. Zach is at the smithy nearest the monastery and Ota at the one in the SW corner of town.
Fink for the swordsmith. Fink starts the "Queen of Sheba" questline and is located near the entrance of Sasau
Mark for the stables. Mark is first found during the "Hunt begins" quest at the Neuhof stud farm. After resolving the issue at the stables you can convice Zora to let him leave and join you at Privyslavitz.
Vashtek for the stables. He's encountered during the "Horse that bolted." "At your service my lady" and "Masquerade" quests at the stables in Uzhitz.
Fritz and Matthew for the tavern. You'll find these two outside of the tavern in Sasau, followed by the miller's at Ledetchko, and then the Inn in the Glade. After finishing "A rock and a hard place" or "Gallows brothers" questline you can ask them to come to town.
Fritz and Matthew will make you loose money at first, then you get a judge ruling to give them a 2nd chance.