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...
Try running away from Qadir during your trial.
Complete the game with all three characters.
Meet somebody you used to know in life as the Ventrue.
Fail to recruit somebody into your coterie.
Accept your fate in Elysium.
Become Embraced into the Ventrue clan.
Agathon came to your help in the grand finale.
D'Angelo came to your help in the grand finale.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her bitter foe.
Complete Frank Dougherty's questline ("A Nosy Reporter").
Complete D'Angelo's questline.
Meet somebody you used to know in life as the Brujah.
Complete Agathon's questline.
Become Embraced into the Brujah clan.
Rage against your fate and complete the game with any character.
Tamika came to your help in the grand finale.
Hope came to your help in the grand finale.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her latest obsession.
Complete Tamika's questline.
Complete Benoit Segal's questline ("Faith and Myth").
Complete Hope's questlline.
Meet somebody you used to know in life as the Toreador.
Convince Tamika to cooperate with you.
Convince Agathon to cooperate with you.
Convince D'Angelo to cooperate with you.
Convince Hope to cooperate with you.
Become Embraced into the Toreador clan.