Here is the full list of all 28 Vampire: The Masquerade - there are Coteries of New York achievements.
Nobody came to your help in the grand finale. Except for...
Complete the game with all three characters.
Hope came to your help in the grand finale.
Meet somebody you used to know in life as the Toreador.
Become Embraced into the Toreador clan.
Tamika came to your help in the grand finale.
Complete Tamika's questline.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her latest obsession.
Convince Tamika to cooperate with you.
Meet somebody you used to know in life as the Brujah.
Complete Agathon's questline.
Complete Hope's questlline.
Convince Hope to cooperate with you.
Accept your fate in Elysium.
Try running away from Qadir during your trial.
Become Embraced into the Brujah clan.
Rage against your fate and complete the game with any character.
D'Angelo came to your help in the grand finale.
Agathon came to your help in the grand finale.
Complete Frank Dougherty's questline ("A Nosy Reporter").
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her bitter foe.
Convince Agathon to cooperate with you.
Fail to recruit somebody into your coterie.
Complete Benoit Segal's questline ("Faith and Myth").
Meet somebody you used to know in life as the Ventrue.
Complete D'Angelo's questline.
Convince D'Angelo to cooperate with you.
Become Embraced into the Ventrue clan.