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.
Nobody came to your help in the grand finale. Except for...
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her bitter foe.
Complete Benoit Segal's questline ("Faith and Myth").
Meet somebody you used to know in life as the Toreador.
Fail to recruit somebody into your coterie.
Become Embraced into the Toreador clan.
Hope 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 Agathon's questline.
Meet somebody you used to know in life as the Ventrue.
Complete Hope's questlline.
Convince Agathon to cooperate with you.
Become Embraced into the Ventrue clan.
Try running away from Qadir during your trial.
Accept your fate in Elysium.
Rage against your fate and complete the game with any character.
D'Angelo came to your help in the grand finale.
Tamika came to your help in the grand finale.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her latest obsession.
Convince Hope to cooperate with you.
Complete D'Angelo's questline.
Meet somebody you used to know in life as the Brujah.
Complete Tamika's questline.
Convince D'Angelo to cooperate with you.
Convince Tamika to cooperate with you.
Become Embraced into the Brujah clan.