Here is the full list of all 11 Once in Flowerlake achievements.
Move on, refusing to restart the stations.
No building a snowman.
Find the note in the hut.
Find Kate.
See other people for the first time.
Build a snowman.
Restart all stations before you go any further.
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.