Coordinates: 34°05′22″N 70°40′59″E / 34.0894°N 70.683°E / 34.0894; 70.683
Achin is a district in the south of Nangarhar Province, Afghanistan, bordering on Pakistan. Its population is 100% Pashtun.
Achin is home to the Shinwari tribe, one of the largest Pashtun tribes. It was a stronghold of the Mujaheddin during the Soviet occupation of Afghanistan.
The primary licit crop in Achin is wheat. Collecting and selling firewood, and manual labor, are other income-generating activities. Tobacco is also grown in the district.
In 2000, UNDCP recorded 130 poppy-growing villages in Achin, making it the greatest opium growing district in eastern Afghanistan that year.