Here is the full list of all 12 Nostos achievements.
Recruit a villager for the first time.
Complete Mission: Panacea.
Complete Mission: Gear and Hammer.
Complete Mission: The Awakened.
Complete Mission: Hero.
Complete Mission: Treasure.
Complete Mission: Henosis.
Research a knowledge module for the first time.
Die for 10 times.
Cook at least 50 dishes.
Burn at least 60 Coral Seas to the ground.