legend_ending_achievements_effect

legend_ending_achievements_effect = {
	if = {
		limit = {
			exists = promoted_legend
		}
		if = { # If you have the legend of Scota
			limit = {
				is_ai = no
				promoted_legend ?= {
					has_legend_chronicle = ancient_people
					legend_property:culture ?= culture:ancient_egyptian
					legend_property:title ?= title:k_scotland
					legend_property:original_region ?= geographical_region:ghw_region_egypt_et_al
				}
			}
			add_achievement_global_variable_effect = {
				VARIABLE = ce1_the_pharaoh_islands_achievement_unlocked
				VALUE = yes
			}
		}
		if = {
			limit = { is_ai = no }
			add_achievement_global_variable_effect = {
				VARIABLE = ce1_legendary_achievement_unlocked
				VALUE = yes
			}
		}
		if = { # If you finish your ancestor's legend
			limit = {
				is_ai = no
				has_variable = ce1_neverending_story_achievement_possible
				promoted_legend = { has_variable = ce1_neverending_story_achievement_possible_legend }
			}
			add_achievement_global_variable_effect = {
				VARIABLE = ce1_neverending_story_achievement_unlocked
				VALUE = yes
			}
		}
		if = { # If you finish a mythical legend as a count
			limit = {
				is_ai = no
				highest_held_title_tier = tier_county
				promoted_legend = { legend_quality = mythical }
			}
			add_achievement_global_variable_effect = {
				VARIABLE = ce1_local_legend_achievement_unlocked
				VALUE = yes
			}
		}
	}
}

As written in game/common/scripted_effects/06_dlc_ce1_legend_effects.txt.