Yeah but the achievement doesn't exist though
Peaceful victory
Full house is different from peaceful victory because in order to get the peaceful victory achievement you should win with EVERY SINGLE piece still on board (including your opponent's ones too) while in order to get the full house achievement you have to win with ONLY all of your pieces still on board
There is no achievement called peaceful victory he just fooled you he just made a fool out of himself
The best way to get this, is probably to play an unrated game against your friend, convince them to do fool's mate, and Checkmate them.
That's not a real achievement
Pretty sure it is, according to this guy
https://youtu.be/ZKaoKbu2Vug?si=St7vHMq-6sLdPIat
What about fool mate it is technically a peaceful victory