has anyone figured this out yet? my best guess is maybe the rusty spoon has something to do with it but i have no idea

No it is not connected with rusty spoon at all. More like keyboard combination))

Originally posted by Arthurio Nevermore ☂:

No it is not connected with rusty spoon at all. More like keyboard combination))

Why would you think it's a keyboard combo?

I don't think - I know exactly, because I got it after all :)
I play on keyboard, but I think controller will fit as well

Originally posted by Arthurio Nevermore ☂:

Hi, guys! Maybe some of you can give some hints or advices about how to get this achievement? ... Also if I figure it out by myself, I will write how to get it in this topic :)

So are you going to share with the rest of the class, as you said you would?

I will give you a hint :)
It's popular cheat code among players on all platforms

Originally posted by Arthurio Nevermore ☂:

I will give you a hint :)
It's popular cheat code among players on all platforms

Lol. I don't know any cheat codes, so that's not at all helpful. Not to mention the phrase "cheat code" itself is vague, and could refer to the game, the game controls, the game system played on, or the platform played on.

I've tried the konami code but it doesn't seem to be working is there something else we have to do, like a location to enter it?

Lycanwolf50 is close enough. Three things that I can advice.
1.) The code should be entered during the game.
2.) Be sure you enter it fast enough.
3.) Think about the last symbol (after the code is entered).

If no success - I will write how to do it on 31st of December :)

For the moment I will confirm that location doesn't matter and this is the KONAMI code indeed.

Thanks for the hints. I looked up Konami Code for keyboard.
Some people say the first part is "up arrow, up arrow, down arrow, down arrow, left arrow, right arrow, left arrow, right arrow". Other people say it's "w, w, s, s, a, d, a, d". Then the second part is said to be "b, a", or "f, space", or "left shift, space". I've tried all these combos, with and without also hitting the "enter" key last. I'm still not having any success unlocking this achievement. Guess I'll be waiting for December 31st.

Okay, I'm impressed with your efforts :)
Original KONAMI code + "Esc" button in the end

Okay, I've tried "up arrow, up arrow, down arrow, down arrow, left arrow, right arrow, left arrow, right arrow, b, a, esc", and I've tried "up arrow, up arrow, down arrow, down arrow, left arrow, right arrow, left arrow, right arrow, b, a, enter, esc". Neither one is working for me.

I'm also trying to get this

Originally posted by Arthurio Nevermore ☂:

Okay, I'm impressed with your efforts :)
Original KONAMI code + "Esc" button in the end

Could you specify the exact keyboard buttons you used to get this? I don't have a controller, and I'm having the same problem as Kenpoleon.