Set the conquer progress of the Scripted Mission Objective to 1 (max). Equivalent of Objective.setProgress(1).
Just like any other Mission Objective property, it doesn't work with Conquer Area Objective, or any other Vanilla objective type, but only with Scripted Mission Objective spawned with spawnMissionObjective call.
Notice: When all the objectives in a Mission Phase are completed (progress = 1) the Next Phase is automatically triggered

Return value