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