Load a mission in the Arma 3 Editor
use the Debug console for:
["TaskSucceeded",["Disable the nuke"]] call BIS_fnc_showNotification;
The notification will appear in 90% of the cases, however always without the given texts. Same problem with
["TaskAssigned",["Disable the nuke"]] call BIS_fnc_showNotification;
only "ScoreAdded" seems to work.