You can 1v1 me I'll probably blunder a knight accidentally in 5 moves
The rarest achievement in chess.com!?

All this achievements are not the rarest. The rarest is the brilliant move recognition. You make a brilliant move that even Stockfish might overlook.

hey theres a achievement called "pasifist victory"
for winning whitout killing or losing any piece
You probably watched the Croissant video
I hate that guy, he always clickbait’s. He even admitted it doesn’t exist (Coming from someone with all the awards)
Full house exist but it's that YOU have to win without losing any piece (I heard pawns excluded) and you can capture as many pieces as you want but if you lose a piece you can't get the achievement in that game

I recently got the achievement for checkmating with a king move. Definitely not as rare as a win by castling, but I think it's good because I was getting slaughtered and about to lose until my opponent screwed up HARD, allowing me to do it.

correction: you have 144/145 & are missing your 'happy anniversary' achievement (i have all of them).

It is the second rarest achievement after brilliant move recognition. And the spelling is wrong. It is peaceful victory. I watch his channel too.
Ya I suck