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