Here is the full list of all 21 Oneiros achievements.
Scored 5000 points in Miami Street Skater 3.
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?
Unlocked all combination locks.
You've fixed the car!
You've cooked the fuel, OMG.
Pulled out the "Cuckoo".
Gave the bird all snacks.
Reached an agreement with the Bird.
Charged the battery full.
Well, you've catched a rat.
Found the Egg.
Managed to get on the other island.
Finally, it's open!
Finished the Unicorn game.
Logged into the laptop.
Found all anatomy books.
Found all gameboxes in the room.