Here is the full list of all 21 Oneiros achievements.
Seen every movie at the Cinema.
Found all anatomy books.
You flushed the toilet, well done.
Finished the Unicorn game.
Found all gameboxes in the room.
You've fixed the car!
Well, you've catched a rat.
Charged the battery full.
You've cooked the fuel, OMG.
Finally, it's open!
Is there anyone on board who can fly this thing?
Where am I?
Managed to get on the other island.
Logged into the laptop.
Reached an agreement with the Bird.
Unlocked all combination locks.
Scored 5000 points in Miami Street Skater 3.
Gave the bird all snacks.
Found the Egg.
Finished the Arcade Game.
Pulled out the "Cuckoo".