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