ADOM install does not import achievements from Steam
If you run ADOM on multiple computers, local achievement list is incomplete
I run ADOM from work at lunch, and also at home. My Steam achievement list correctly displays 20/83 achievements. My work only displays 16/83 - it does not display the 4 achievements I got at home. Similarly my home install doesn't display all the ones I got at work.
When launching ADOM I would expect it to import achievements from Steam / check achievements from steam so I can use the local UI to check them.