These positions typically require a Master's Degree in Library Information Science from an ALA accredited program; some positions also require years of experience.
Archivist I (Houston Metropolitan Research Center)
http://agency.governmentjobs.com/houston/job_bulletin.cfm?JobID=437519
Archivist II (The African American Library at the Gregory School)
http://agency.governmentjobs.com/houston/job_bulletin.cfm?JobID=440699