There are many achievements in Lost in Random and some of them can easily be missed. One of them is the Knock Knock achievement that you can get or miss early in the game.
This achievement can be obtained once Even wakes up after dreaming about Odd and the ghost. If you don't get it before you get too far in Onecroft, you won't be able to get this achievement.
Related: How to Get Coins in Lost in Random
Once Even wakes up, follow the ghost and leave your house. Talk to Astrid and convince her to let you pass. Continue and you will see Lucky, Bernard and Algot. From there, you will have two paths to take. Take the left path and go down the tunnel. You will recognize this as the path you took to hide from Nanny Fortuna. It takes you back to your home.
Follow the path to your door and interact with you. The narrator will tell you that Even must not hit. Keep interacting with the door and ignore the narrator who insists you don't knock. After five attempts, the narrator will finally let you knock. Once you do, you will receive the Knock Knock achievement. Make sure you get this achievement because you won't be able to do it later.
For more information on Lost in Random, see How to Get Dice Crystals in Lost in Random and How to Get Cards in Lost in Random on Creamofgames.
