Here are all the details for the legacies included in this mod as of v1.0 release:

Available to bellicose and courtly ethos; and cultures with Hereditary Hierarchy, Only the Strong, Chivalry, or Chanson de Geste traditions.

Romantic: 10 attraction opinion, medium romance scheme power
Valiant: 10% monthly prestige, 15% knight effectiveness
Poetic: 10 courtier and guest opinion, 5 court grandeur, 50% court grandeur change, medium learn language scheme power
Gallant: 1 max knight, 0.2 prestige per knight, 0.2 piety per knight
Heroic: 1 diplomacy per prestige level, 1 prowess per prestige level

Available to all.

RIghteous: 5% monthly piety per powerful vassal on the council, 5 faith advantage
Venerate: 15% same faith domain tax
Sanctify: -10% church holding and building speed, -10% church holding and building gold cost
Unwavering: -20% holy order cost, 1% monthly piety per knight
Ardent: 1 learning per piety level, 10% same faith levy reinforcement rate

Available to bellicose and stoic ethos; and cultures with Ruling Caste, Castle Keepers, Staunch Traditionalists, Recognition of Talent, Swords for Hire, Only the Strong, Eye for an Eye, Martial Admiration, Warrior Culture, Performative Honor, The Right to Prove, Trials by Combat, or By the Sword traditions.

Ruthless: 20% dread gain, 10% pursue efficiency, 10% enemy casualties
Oppressive: 10 natural dread, 10% war income
Dark Rumors: -20% dread decay, 0.1 monthly prestige per dread
Intimidating: -10% MAA maintenance, 10% intimidated vassal levy contribution, 20% cowed vassal levy contribution
Brutal: 1 martial per prestige level, 1 prowess per stress level

Available to all.

Earnest Efforts: -25% short reign duration, 30 day hostile scheme resistance
Ever-Improving: -10% build speed, 20% development growth
Always Learning: 10 councillor opinion, 15% cultural fascination progress
Meticulous: 1 domain limit, 5 popular opinion
Perseverance: 1 learning and stewardship per stress level, 5% income per stress level

Available to all.

Power Dynamics: 10 vassal limit, 10 opinion with liege and fellow vassals, 5 opinion with direct vassals and courtiers and guests
Astute: 0.1 monthly control, 10% vassal tax contribution
Cunning: medium scheme power for befriend, sway, and murder schemes
Popular Persona: 5 popular opinion, -0.05 monthly tyranny
Trusthworthy: 1 intrigue per prestige level

Available to bureaucratic and egalitarian ethos; and cultures with Astute Diplomats, Family Business, Maritime Mercantilism, Expert Artisans, or Xenophilic traditions.

International Trade: 15% diplomatic range, 10 independent ruler opinion, 5 court grandeur
Artisans: 15% domain taxes, -5% build speed and gold cost
Guarded Roads: 1 max knight, -20% MAA maintenance, -20% mercenary hire cost
Investors: 20% powerful vassal councillor tax contribution
Established Routes: 15% diplomatic range, 25% long reign bonus, 1 stewardship per prestige level

Available to cultures with Maritime Mercantilism, Coastal Warriors, Dexterous Fishermen, Practiced Pirates, Seafarers, or Polders traditions.

Sea Legs: 1 prowess, -25% embarkation cost, can cross water without penalty
Well-Traveled: 30% diplomatic range, 10 different culture opinion
Sea Breezes: -10% stress gain, 10% stress loss, 20% naval speed
Maritime Law: 10% war income, 5 coastal advantage
Bountiful Seas: -20% army maintenance, 20% supply duration, 20% supply capacity

Available to all.

Fruitful Labors: 10% fertility, 5 years of fertility
Comforts of Home: 5 court grandeur, 10 spouse opinion, 10% stress loss
Prolific Flirt: medium scheme power to seduction, romance, and elope schemes
Refined Tastes: 10% positive trait inheritance and strengthen chances, -10% negative trait inheritance
Sweet Corruption: 1 intrigue per stress level, 1 max seduction scheme

Available to any culture that doesn't have an egalitarian ethos or one of the Culture Blending, Malleable Subjects, Malleable Invaders, Xenophilic, Linguists, Religion Blending, African Tolerance, or Steppe Tolerance traditions.

Enduring: 25% long reign bonus, -10% title creation cost, 10% same faith taxes
Unified Front: 5 natural dread, 5 opinion for dynasty and house members, 10 close family opinion
Customary: 15% monthly piety and prestige
Like-Minded: 5 opinion for same culture and faith, -20% cost for same culture mercenaries and holy orders
Established: 1 diplomacy per piety level, 30 day personal scheme resistance

Available to dynasty heads with the witch trait or witch secret.

Profane Rites: 10% fertility, 5 life expectancy
Initiation: 1 max convert to witchcraft schemes, medium convert to witchcraft scheme power
Sorcerous Studies: 15% cultural fascination progress, medium learn language scheme power
Otherworldly Aura: 0.1 monthly piety per dread, 5 natural dread
Dark Mysticism: 1 intrigue per piety level