All Under Heaven achievement

Highway of Ideas

Starting as a ruler of a culture with no Silk Road Innovations, discover a Silk Road Innovation

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).

Unlocks when (happened) (8 lines of game script)

custom_description = {
	text = ep4_17_highway_of_ideas_achievement_trigger
	culture = {
		any_known_innovation = {
			has_innovation_parameter = silk_road_innovation_parameter
		}
	}
}

As written in game/common/achievements/ep4_achievements.txt.

Still possible while (possible) (1 line of game script)

exists = global_var:started_ep4_17_highway_of_ideas_achievement

As written in game/common/achievements/ep4_achievements.txt.

Source: game/common/achievements/ep4_achievements.txt, game/common/achievement_groups.txt and the English localisation, Crusader Kings III 1.20.0.3. Unlock share: Steam Web API, 2026-10-02.