Here is the full list of all 17 The Wandering Village achievements.
Pet, feed, heal and detox Onbu within one day
Produce Black Pudding
Cut down every tree on Onbu’s back
Build the Survival Monument
Pet Onbu
Achieve 100% efficiency with a Berry Gatherer
Get Onbu's heartrate to go above 6 bpm
Feed Onbu with the Onbu Feeding Trebuchet
Build the Onbu Monument
Build the Village Monument
Survive until day 100 without building any Air Wells
Reach a population of at least 500 villagers
Reach a population of at least 200 villagers
Survive until day 100 without building any Farms
Survive until day 100 while using the Onbu Feeding Trebuchet a maximum of 3 times
Survive until day 100 without harvesting any Berries
Lose a villager on a scavenging mission