Well...if you want to be technical...
You can take each specific storyline... Just in case, I'll spoiler cut these.
[spoiler]Who are Vicki's parents?
Burke's Revenge
The Car Crash
Bill Malloy's Murder
The Phoenix
Jason McGuire
Maggie's Kidnapping
Julia Attempting to Cure Barnabas
Barnabas Terrorizing Julia
The Vampire Curse on Barnabas
Vicki's Witchcraft Trial
Trask vs. Barnabas
Millicent and Nathan
Peter/Jeff and Vicki
Adam and Eve
The Dream Curse
The Premature Burial
Quentin and Beth Haunting Collinwood
Quentin's Portrait
The Hand of Count Petofi
Quentin and Amanda in Hell
The Leviathans
Angelique's Hold on Collinwood
Barnabas Entombed
Cyrus's Experiment
Collinwood Destroyed
Gerard, Daphne, Tad, and Carrie haunting Collinwood/Rose Cottage
Judah's Head
Gerard Possessed
Quentin's Witchcraft Trial
The Lottery
Bramwell and Catherine
[/spoiler]
I THINK that's it...correct me if I'm wrong.