Here is the full list of all 21 Oneiros achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Oneiros beater!
You saw every movie in the cinema
Great clicker!
You flushed water at cinema
Enjoy the fly!
Chevrolet fixed
You cracked everything!
Almost ready to ride!
Good job! You are charged!
Great, another fat bird!
Are you bird person?
Great, you can grab rats!
Easter, easter, easter
You are curious about the world!
Hold it tight!
You escaped!
You found every anatomy book in the game
Finished Unicorn game
Real skater!
oneirOS activated
Found every game in the room