Here is the full list of all 39 Your Island -KIMI NO SIMA- achievements.
population 100
population 200
population 300
population 400
population 500
population 600
years 100
years 200
years 300
years 500
years 1000
Culture Lv2
Culture Lv3
Culture Lv4
Culture Lv5
Culture Lv6
years 2000
Living with only herbs and mushrooms in Challenge mode
Living with only fishes in Challenge mode
Achieve 100 people with 100 flower beds built in challenge mode
Living without a balloon in challenge mode
Living with lower Ark in challenge mode
Living without a single death in challenge mode
Living in a house of one square in challenge mode
Living on a very, very small island in challenge mode
Life short and living in illness
Achieveed 100 population in MANIAC mode
Achieveed 100 population in STOIC mode
Achieveed 100 population inULTRA mode
Culture Lv7
Culture Lv8
Living on an island with 10 times the fire rate
Living on an island with a waste generation rate of 11 times
3 Event Huge Buildings to be Built in 50 Years
Population 25
Population 50
100 population Time attack
Super small island challenge
Ultra small island challenge