Killing a piglin, hoglin or a shulker on peaceful mode grants the advancement "Monster Hunter" which is not supposed to be achievable on peaceful. The "Monster Hunter" advancement also gives the description: "Kill any HOSTILE monster" and as the hoglins, piglins and shulkers are not hostile on peaceful mode, this advancement should not be granted when they are killed on peaceful mode.
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Shulkers do grant the "Monster Hunter" advancement way before this ticket got created. Also I think they grant the "Monsters Hunted" advancement which you can get 3/27 mobs killed.