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