Here is the full list of all 20 Founders' Fortune achievements.
Survive your first winter
Accept a ghost as a new member of the village
Befriend the pirates
Annoy the traders until send a raid against you
Earn over 10,000 coins in a single trade
Complete a masterpiece
Have a villager unlock every skill in one profession
Have a villager unlock every skill in every profession
Welcome a child to the village
Celebrate a child becoming an adult
Successfully demand a tribute or present
Increase a villager's mood until they get a motivation boost
Equip a villager with an axe
Equip a villager with armor that has a 17 protection rating or more
Equip a villager with a weapon that does 11 damage or more
Have at least 30 tamed animals at the same time
Survive a raid without anyone falling unconscious
Save a villager from bleeding out when they have less than 10% of their health left
Sail off into the sunset and start a NewGame+
Sail off after playing on the hardest difficult with default world settings