Here is the full list of all 11 Once in Flowerlake achievements.
Complete the game.
Talk to the Centre by restarting all the stations.
Restart all stations before you go any further.
A conversation with Kate when the snowman is made.
Find the note in the hut.
Find Kate.
See other people for the first time.
Build a snowman.
No building a snowman.
Move on, refusing to restart the stations.
Find a robotic dog.