That action group would contain (at the very least) an action to modify the variable AICC_Lesson_Status (which is just Lectora’s name for the underlying variable it is referring to, the SCORM 1.2 variable cmi.core.lesson_status), and set it equal to one of the statuses in that run-time reference I posted before (e.g. completed).
As long as the AICC_Lesson_Status is being modified in the Lectora content, it doesn’t care about the score (in SCORM 1.2 the score of an assessment is directly tied to the lesson status, but not all LMS’s are set up to recognize this which is why I would play it safe and modify the AICC_Lesson_Status variable instead of modifying the AICC_Score variable).
In Lectora, you can group together at least two actions, and call it something like completion_group. Create whatever other actions you feel are necessary in the group, but make sure to at the very least have the action Modify Variable set to target AICC_Lesson_Status with type Set Equal To with value completed.