There are 30 core skills for the core professions (warrior, monk, elementalist, mesmer, necromancer, ranger). Nightfall has, on top of that, 10 elites for each of those six, plus the assassin and ritualist, and 15 elites each for the paragon and dervish. 30core+60 NF Core Char. +20 NF Factions Char. +30 NF char. =140
The core skills count towards all 3 campaign title tracks, so if you cap all 30 of them, then you will see each Skill Hunter title track go up by 30 skills.
As you mentioned Lightbringer Signet is the odd skill. What I learned in looking this up is that Junundu Seige does not count.
http://gw.gamewikis.org/wiki/Elite_skills_list
Core skills are on top, Nightfall skills are on the bottom. I rather enjoyed going after this title myself. Have fun and hope you get a green drop or two out of it.
Also, if you go to the download section of this site (site, not forum), they have a program called Mapping Out. It allows you to track what skills your character has capped, and shows you which ones they still don't have with maps and quite a bit other information. Very useful for this title. Still check against the wiki though as wiki's boss maps show the path to the boss, and has more complete information than Mapping Out does.
