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