Here is the full list of all 25 Creator of Another World achievements.
Made a lover
Invited someone to the group
Expanded the world
Discovered a secret place
Completed your first quest
Invited someone for the first time
Started the game
First successful cooking
Got married
A child was born
Created My Town
Number of defeated enemies exceeded 1000
Surpass 50th level
Surpass 100th level
Caught an oarfish
Win the snowball game
Win 10 times at the arena
Win the maze
Beat the Underworld
Defeated the Goddess
Defeated the King of the Gods
Defeated the Evil Tower boss
Defeated the Demon King (excluding unique events)
Invited to Your Town
Escaped from the Infinite Prison