We have "Flawless Victory", "Divine Guidance", and "Happily Ever After". How about group-winning for neutrals too?
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Assassin's Creed:
As a Serial Killer, win the game with at least 1 other Serial Killer left standing.
Legend:
As a Survivor, win the game with at least 1 other Survivor left standing.
Lord of Trolls:
As a Jester, win the game with at least 1 other Jester lynched.
Salem Takeover:
As a Witch, win the game with at least 1 other Witch left standing.
Flame War:
As an Arsonist, win the game with at least 1 other Arsonist left standing.
Angry Juror:
As an Executioner, win the game with at least 1 other Executioner winning.
Special Education:
As an Amnesiac, win the game with at least 1 other Amnesiac left standing.
Chainsaw Massacre:
As a Mass Murderer, win the game with at least 1 other Mass Murderer left standing.