So I have actually won a game without capturing or losing any pieces, because of course someone played this a bit stupidly but I can unfortunately confirm the achievement is fake because I have not obtained it.
Peaceful victory
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What you heard is misinformation, Peaceful Victory achievement doesn’t exist.
The Youtube video has captions, please read them.
A Fool’s mate would be checkmate without any pieces captured.
I did Peaceful Checkmate BUT I didn't get the award 
BUT I got: Quick Knockout : Which fine...
Sep 24, 2024
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#47
DoingCompetition wrote:
I did Peaceful Checkmate BUT I didn't get the award
That's because it's not a real achievement
So i tried it with one person. its not true if u saw it on ytb its just clickbait
Oct 11, 2024
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#50
david123456chess wrote:
Yesterday I heard of a new secret achievement called Peaceful Victory where you checkmate without capturing or losing ANY piece at all. Is this real? If it is I will try to obtain it.
Its Full House not Peaceful Victory
Oct 11, 2024
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#54
That's how I got full house achievement (where u win without losing any piece (I heard pawns excluded but I didn't lose a pawn anyway)
Hey guys!
I would get the peaceful victory but I didn't got it . so I think you should never try it.
check out channel crossaint
by the way chessguylarry its not true
wait then that achievement might be just being created by the one who made this video.