I've fixed the name of the character script you have to use, it is GLO_SneakSpotter.
However, I just noticed that the GLO_Checkpoints story file, which defines this functionality, is in the DivinityOrigins mod rather than in the shared mod :| That's really too bad, because there is nothing specific to the DivinityOrigins campaign about it. I guess your mod only depends on Shared? In that case, I would suggest you open the DivinityOrigins mod, copy the contents of that goal, and then add it to a goal in your own mod. Keep in mind that this goal must be initialised before any other goal that defines DB_CheckPoint() facts gets activated, so best name it _GLO_Checkpoints or so.
I will add that to the wiki page.
