What is the hardest achievement to get on Chess.com


So what is the hardest single achievement? Getting a higher puzzle rating requires getting multiple achievements in a row.


It's not really an achievement, but the "North Korea" passport definitely qualities. I bet nobody who has it was actually playing someone from NK. Probably someone who put that as a joke, or to help people get that passport.
Checkmate with a king move or (especially) castling are also big contenders, as both of these are dependent on your opponent screwing up horribly.

I have full house but I don't understand what it is as I looked at when I got it and I lost a pawn. Can someone explain pls. Thanks

I have been trying to get as many achievements on Chess.com. Some achievements, like "Self-portrait", are easy, but others, like "Full House", are harder. I have spent too much time thinking about this, so I want to ask you what the hardest achievement is.