Here is the full list of all 19 Lost in Play achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
You made a bone rubble out of the giant turtle, if only we could turn back time
You made it home!
You entered a dream and retrieved the crown while falling through space merged to your sibling, good job!
That was a nice usurpation!
You broke out of prison thanks to a chicken
You licked the night pot at the prison
Complete the Jellyfish puzzle
You entered the dragon cave (not a reference to the Bruce Lee movie)
You exited the dragon cave (see, there is no Bruce Lee movie by that name)
A dream within a dream
You just made a baby cry, I hope you are proud of yourself
You won a game of crab-checkers against the Seagul
Survived the ocean and sailed away
You snapped back into reality, or did you?
You won a game of fox and hounds against a forest critter and lived to tell the tale
When you become a moster, be careful not to fight one
But you're not the only one
You really like changing radio stations
That's the second biggest cat I've ever seen