You're most likely missing those irritating side-quests that are part of the Objective but not part of the storyline. At the Shrine of Saint Veloth, this is The Wounds in the World. At the Hatching Pools, this is Outside Interference.

For Cadwell's, you want Cadwell's Almanac. We don't have a list of every quest per Objective outside of Cadwell's, but we are trying to add the Objective quests to each individual location page (see eg Northpoint). That's only part way through implementation at the moment though.

I have also been considering adding Cadwell markers to the faction storyline quest lists, but that doesn't list side quests, so you'd still be missing a few if you based it solely on that anyway. Finally, I have been developing a story progression chart for adding to the faction pages, which will include all Cadwell's, but that's something else that's not finished yet.

In Eastmarch: not really, although the entirety of Cradlecrush is not in the story chain (and IMO shouldn't be part of Cadwell's at all, as it's not even really story-relevant).

In The Rift: Worm Cult Summoner is a side quest at Trolhetta (the last Almanac objective).

Lifeline and Our Poor Town are, confusingly, actually not technically part of the Wittestadr Objective (which is why they're not listed on the Almanac page), although they are still required before you can start the Mistwatch Objective.