Hello @Tom_Dua,
Can you see at least some of the reports or none at all? Recently there was a similar thread where only Person report was available, the issue was due to missing Observation Period records. The code for data density in Achilles relies on data collected by analysis queries that also involve Observation Period.
Database user permissions seem to be fine, otherwise ATLAS would display ‘Error loading report’ message instead of an empty report. Might be worth checking ATLAS’s own permissions, as proposed by @jcabrerazuniga.