Simply purchase a Jump Drive from one of the station vendors and then leave the Texas system through any of it's jump gates.
This achievement is currently bugged and not unlocking for people as of October 9th, 2020. When and if this is patched, I will remove this message. NOTICE!:
As stated by Koborover, the achievement has been patched as of October 13th, 2020. https://rebel-galaxy.com/patch-notes-october-13th-2020/
*The “On The Road” achievement will now trigger correctly. For anyone who missed this achievement, it will now pop the first time Juno moves through any jump gate.