Here is the full list of all 28 Vampire: The Masquerade - there are Coteries of New York achievements.
Agathon came to your help in the grand finale.
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.
Meet somebody you used to know in life as the Brujah.
D'Angelo came to your help in the grand finale.
Hope came to your help in the grand finale.
Complete Hope's questlline.
Complete Adelaide Davis' questline ("Somebody's Watching Me") as her latest obsession.
Complete D'Angelo's questline.
Meet somebody you used to know in life as the Ventrue.
Convince D'Angelo to cooperate with you.
Convince Hope to cooperate with you.
Become Embraced into the Ventrue clan.
Rage against your fate and complete the game with any character.
Tamika came to your help in the grand finale.
Complete Tamika's questline.
Complete Agathon's questline.
Complete Frank Dougherty's questline ("A Nosy Reporter").
Complete Benoit Segal's questline ("Faith and Myth").
Meet somebody you used to know in life as the Toreador.
Convince Agathon to cooperate with you.
Convince Tamika to cooperate with you.
Fail to recruit somebody into your coterie.
Become Embraced into the Toreador clan.
Accept your fate in Elysium.
Try running away from Qadir during your trial.
Become Embraced into the Brujah clan.