The spelling of the word "Atchecnese" is not standard and can cause confusion when trying to pronounce it correctly. However, it appears to be a variation of the word "Atchafalaya," which is the name of a river in Louisiana. The IPA phonetic transcription of "Atchecnese" would be /əˌtʃæfəˈniːz/. The "ch" sound represents the "sh" sound, the "e" at the end is not pronounced, and the stress is on the second syllable.