This prototype is used for receiving an achievement when the player builds an entity.
AchievementPrototypeEntityIDfalsefalseThis will trigger the achievement, if this entity is placed.
to_build = "locomotive"
uint32truefalseHow many entities need to be built.
booleantruefalseIf this is false, the player carries over their statistics from this achievement through all their saves.
MapTicktruefalseThe achievement must be completed within this time limit.
within = 60 * 60 * 60 * 8 -- 8 hours