Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Ethnologue classifies Ache as a Southeastern Loloish language, and lists 35,000 speakers as of 2003. Ache has not been analyzed in classifications of Southeastern Loloish by Pelkey (2011) and Lama (2012), and hence remains unclassified within the Loloish branch.
References
Ache at Ethnologue (18th ed., 2015) (subscription required)
"China". Asia Harvest. Archived from the original on 2013-08-01. Retrieved 2013-07-19.
雲南省民族事務委員會研究室印 (1955). 雲南民族識別參考資料 (in Chinese). p. 40.
Lama, Ziwo Qiu-Fuyuan (2012). Subgrouping of Nisoic (Yi) Languages: A Study from the Perspectives of Shared Innovation and Phylogenetic Estimation (PhD thesis). University of Texas at Arlington. hdl:10106/11161.
Pelkey, Jamin (2011). Dialectology as Dialectic: Interpreting Phula Variation. Berlin: De Gruyter Mouton.