In Xanadu

Conditions as the game checks them

Possible decides whether the achievement can still be earned in a run; happened is the check that unlocks it (common/achievements/_achievements.info).

custom_description = {
	text = mpo_in_xanadu_achievement_trigger
	any_sub_realm_county = {
		any_county_province = {
			has_building_or_higher = pleasure_dome
		}
	}
}

The file gives no “possible” condition for this one.