In achalasia cardia, true is -
The pressure is elevated at LES with incomplete relaxation on deglutition. The normal pressure of LES is 13.8 ±4.6 of Hg. In Achlasia it increases to twice normal.

Also know

Hypertensive Lower esophageal sphincter

is another motor disorder distinct from Achalsia
here the LES pressure is elevated but it relaxes normally. Peristalsis in the esophageal body is also normal.
Pressure at distal end increased with no peristalsis
Low pressure at LES with no peristalsis
Pressure > 50 mm Hg with peristalsis
Pressure at the distal end increased with normal relaxation