Parallels Plesk saves user actions in the internal action log stored in the Parallels Plesk database. Configuration parameters of the Plesk Action Log are available on the Tools & Settings > Action Log screen, where it is also possible to download the action log for a selected time period.
However, it is also possible to fetch the action log records directly from the database using the script attached to this article. This script should be run with super-user (root) privileges, as access to the Plesk database is required. Once executed, it will produce an output in human-readable format as the standard output.
To download and execute the script, use these commands:
# wget http://kb.sp.parallels.com/Attachments/24233/Attachments/action_log.zip
# unzip action_log.zip
# chmod +x action_log.sh