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