Here is the full list of all 29 Foundation achievements.
Build the Medicinal Garden Masterpiece whilst fulfilling its effect conditions.
Survive the bad weather event without losing a villager
Complete a military campaign
Reach 100 population
Build your first church
Purchase your first territory expansion
Amass 10,000 gold
Reach 500 population
Spawn the black sheep
Complete all military campaigns
Promote a soldier to Knight
Study a blueprint
Study all blueprints