Minecraft wiki entry for Achievement_guide, associated text: It will take at least 192 iron ingots as well as 32 sticks to craft enough rails (32 * 16). Alternatively, you can find and break them in mineshafts or woodland mansions. Then, build a continuous track so that a minecart can travel the full distance. Afterwards, place a minecart on the start of the track, then travel from the start to the end without leaving the minecart. The achievement does not allow you to repeatedly loop the same section of the track.