Achham 1 is one of two parliamentary constituencies of Achham District in Nepal. This constituency came into existence on the Constituency Delimitation Commission (CDC) report submitted on 31 August 2017.
Achham 1 incorporates Sanphebagar Municipality, Mellekh Rural Municipality, Chaurpati Rural Municipality, Bannigadhi Jayagadh Rural Municipality and Ramaroshan Rural Municipality.
It encompasses the following Sudurpashchim Provincial Assembly segment