ce3_papal_bull_check_effect

ce3_papal_bull_check_effect = { # Papal Bull
	# had_sex_with_effect runs this, and the pope may be root or scope:had_sex_with_effect_partner
	if = {
		limit = {
			has_title = title:k_papal_state
			pam_pope_is_head_of_faith_or_rite_trigger = yes
			exists = puppeteer
			puppeteer = {
				any_spouse = { this = scope:had_sex_with_effect_partner }
			}
		}
		puppeteer = {
			add_achievement_global_variable_effect = {
				VARIABLE = ce3_12_papal_bull_achievement_unlocked
				VALUE = yes
			}
		}
	}
	else_if = {
		limit = {
			scope:had_sex_with_effect_partner ?= {
				has_title = title:k_papal_state
				pam_pope_is_head_of_faith_or_rite_trigger = yes
				exists = puppeteer
				puppeteer = { any_spouse = { this = root } }
			}
		}
		scope:had_sex_with_effect_partner.puppeteer = {
			add_achievement_global_variable_effect = {
				VARIABLE = ce3_12_papal_bull_achievement_unlocked
				VALUE = yes
			}
		}
	}
}

As written in game/common/scripted_effects/00_achievement_effects.txt.