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.
Tamika came to your help in the grand finale.
Complete Tamika's questline.
Meet somebody you used to know in life as the Toreador.
Convince Tamika to cooperate with you.
Become Embraced into the Toreador clan.
Hope came to your help in the grand finale.
D'Angelo came to your help in the grand finale.
Complete D'Angelo's questline.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her bitter foe.
Convince D'Angelo to cooperate with you.
Complete Hope's questlline.
Meet somebody you used to know in life as the Ventrue.
Convince Hope to cooperate with you.
Fail to recruit somebody into your coterie.
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.
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 latest obsession.
Complete Agathon's questline.
Complete Benoit Segal's questline ("Faith and Myth").
Meet somebody you used to know in life as the Brujah.
Convince Agathon to cooperate with you.
Become Embraced into the Brujah clan.