This is a collaborative walkthrough for Mortal Kombat X. Please add any missing information to any section and/or correct any mistakes that you can find.
Chapter 1: Johnny Cage
Fight 1
Johnny Cage vs. Scorpion
QTE (Quick Time Event) sequence happens before the fight.
Johnny Cage Variation: A-List
Scorpion Variation: Ninjutsu
Stage: Destroyed City (Past)
Reward: Finishing the fight unlocks the Past variant of the Destroyed City stage.
Fight 2
Johnny Cage vs. Sub-Zero
Johnny Cage Variation: A-List
Sub-Zero Variation: Unbreakable
Stage: Destroyed City (Past)
Fight 3
Johnny Cage vs. Jax Briggs
Johnny Cage Variation: A-List
Jax Variation: Pumped Up
Stage: Dead Woods
Fight 4
Johnny Cage vs. Shinnok
Johnny Cage Variation: A-List
Shinnok Variation: Impostor
Stage: Jinsei Chamber
Reward: Destroyed City (Past)
Chapter 2: Kotal Kahn
Fight 1
Kotal Kahn vs. Kano
QTE (Quick Time Event) sequence happens before the fight.
Kotal Kahn Variation: Sun God
Kano Variation: Cybernetic
Stage: Outworld Marketplace
Fight 2
Kotal Kahn vs. Tanya
Kotal Kahn Variation: Sun God
Tanya Variation: None
Stage: Outworld Marketplace
Fight 3
Kotal Kahn vs. Rain
Kotal Kahn Variation: Sun God
Rain Variation: None
Stage: Outworld Marketplace
Fight 4
Kotal Kahn vs. Mileena
Kotal Kahn Variation: Sun God
Mileena Variation: Piercing
Stage: Outworld Marketplace
Chapter 3: Sub-Zero
Fight 1
Sub-Zero vs. Cassie Cage
Sub-Zero Variation: Cryomancer
Cassie Cage Variation: Brawler
Stage: Lin Kuei Temple
Fight 2
Sub-Zero vs. Takeda
Sub-Zero Variation: Cryomancer
Takeda Variation: Ronin
Stage: Lin Kuei Temple
Fight 3
Sub-Zero vs. Jacqui Briggs
Sub-Zero Variation: Cryomancer
Jacqui Briggs Variation: Full Auto
Stage: Lin Kuei Temple
Fight 4
Sub-Zero vs. Kung Jin
Sub-Zero Variation: Cryomancer
Kung Jin Variation: Ancestral
Stage: Lin Kuei Temple
Chapter 4: Kung Jin
Fight 1
Kung Jin vs. Erron Black
Kung Jin Variation: Shaolin
Erron Black Variation: Gunslinger
Stage: Emperor's Courtyard
Fight 2
Kung Jin vs. Ferra/Torr
QTE (Quick Time Event) sequence happens before the fight.
Kung Jin Variation: Shaolin
Ferra/Torr Variation: Ruthless
Stage: Emperor's Courtyard
Fight 3
Kung Jin vs. Raiden
Kung Jin Variation: Shaolin
Raiden Variation: Displacer
Stage: Sky Temple
Fight 4
Kung Jin vs. Kotal Kahn
Kung Jin Variation: Shaolin
Kotal Kahn Variation: Sun God
Stage: Emperor's Courtyard
Chapter 5: Sonya Blade
Fight 1
Sonya Blade vs. Scorpion
Sonya Blade Variation: Special Forces
Scorpion Variation: Hellfire
Stage: Quan Chi's Fortress
Fight 2
Sonya Blade vs. Jax
Sonya Blade Variation: Special Forces
Jax Variation: Pumped Up
Stage: Quan Chi's Fortress
Fight 3
Sonya Blade vs. Quan Chi
QTE (Quick Time Event) sequence happens after the fight.
Sonya Blade Variation: Special Forces
Quan Chi Variation: Sorcerer
Stage: Quan Chi's Fortress
Fight 4
Sonya Blade vs. Kano
Sonya Blade Variation: Demolition
Kano Variation: Cybernetic
Stage: Refugee Kamp
Reward: Sonya Blade Costume: Major Blade
Chapter 6: D'Vorah
Fight 1
D'Vorah vs. Baraka
QTE (Quick Time Event) sequence happens after the fight.
D'Vorah Variation: Brood Mother
Baraka Variation: None
Stage: Outworld Marketplace
Fight 2
D'Vorah vs. Rain
D'Vorah Variation: Venomous
Rain Variation: None
Stage: Kuatan Jungle
Fight 3
D'Vorah vs. Tanya
D'Vorah Variation: Venomous
Tanya Variation: None
Stage: Kuatan Jungle
Fight 4
D'Vorah vs. Mileena
D'Vorah Variation: Venomous
Mileena Variation: Piercing
Stage: Kuatan Jungle
Chapter 7: Takeda
Fight 1
Takeda vs. Kenshi
Takeda Variation: Ronin
Kenshi Variation: Possessed
Stage: Destroyed City
Fight 2
Takeda vs. Reptile
QTE (Quick Time Event) sequence happens before the fight.
Takeda Variation: Lasher
Reptile Variation: Nimble
Stage: The Kove
Fight 3
Takeda vs. Erron Black
Takeda Variation: Lasher
Erron Black Variation: Outlaw
Stage: The Kove
Fight 4
Takeda vs. Ermac
Takeda Variation: Lasher
Ermac Variation: Mystic
Stage: The Kove
Chapter 8: Jax Briggs
Fight 1
Jax vs. Kung Lao
Jax Variation: Wrestler
Kung Lao Variation: Tempest
Stage: Krossroads
Fight 2
Jax vs. Sindel
Jax Variation: Wrestler
Sindel Variation: None
Stage: Krossroads
Fight 3
Jax vs. Kitana
Jax Variation: Wrestler
Kitana Variation: Assassin
Stage: Krossroads
Fight 4
Jax vs. Liu Kang
QTE (Quick Time Event) sequence happens before the fight.
Jax Variation: Wrestler
Liu Kang Variation: Flame Fist
Stage: Quan Chi's Fortress
Chapter 9: Scorpion
Fight 1
Scorpion vs. Sonya Blade
Scorpion Variation: Ninjutsu
Sonya Blade Variation: Demolition
Stage: Refugee Kamp
Fight 2
Scorpion vs. Johnny Cage
QTE (Quick Time Event) sequence happens before the fight.
Scorpion Variation: Ninjutsu
Johnny Cage Variation: A-List
Stage: Refugee Kamp
Fight 3
Scorpion vs. Sub-Zero
Scorpion Variation: Ninjutsu
Sub-Zero Variation: Grandmaster
Stage: Lin Kuei Temple
Fight 4
Scorpion vs. Quan Chi
Scorpion Variation: Ninjutsu
Quan Chi Variation: Summoner
Stage: Refugee Kamp
Reward: Scorpion Costume: Hanzo Hasashi
Chapter 10: Raiden
Fight 1
Raiden vs. Baraka
Raiden Variation: Displacer
Baraka Variation: None
Stage: The Kove
Fight 2
Raiden vs. D'Vorah
Raiden Variation: Displacer
D'Vorah Variation: Swarm Queen
Stage: The Kove
Fight 3
Raiden vs. Kung Lao
Raiden Variation: Thunder God
Kung Lao Variation: Hat Trick
Stage: Sky Temple
Fight 4
Raiden vs. Liu Kang
Raiden Variation: Thunder God
Liu Kang Variation: Flame Fist
Stage: Sky Temple
Chapter 11: Jacqui Briggs
Fight 1
Jacqui Briggs vs. Reptile
Jacqui Briggs Variation: High Tech
Reptile Variation: Noxious
Stage: Infected Dead Woods
Reward: Finishing the fight unlocks the Infected variant of the Dead Woods stage.
Fight 2
Jacqui Briggs vs. Ermac
Jacqui Briggs Variation: High Tech
Ermac Variation: Mystic
Stage: Infected Dead Woods
Fight 3
Jacqui Briggs vs. Ferra/Torr
Jacqui Briggs Variation: High Tech
Ferra/Torr Variation: Vicious
Stage: Infected Dead Woods
Fight 4
Jacqui Briggs vs. Kotal Kahn
Jacqui Briggs Variation: High Tech
Kotal Kahn Variation: War God
Stage: Infected Dead Woods
Chapter 12: Cassie Cage
Fight 1
Cassie Cage vs. Sindel
Cassie Cage Variation: Brawler
Sindel Variation: None
Stage: Sky Temple
Fight 2
Cassie Cage vs. Kitana
Cassie Cage Variation: Brawler
Kitana Variation: Assassin
Stage: Sky Temple
Fight 3
Cassie Cage vs. D'Vorah
Cassie Cage Variation: Brawler
D'Vorah Variation: Swarm Queen
Stage: Infected Jinsei Chamber
Reward: Finishing the fight unlocks the Infected variant of the Jinsei Chamber stage.
Fight 4
Cassie Cage vs. Corrupted Shinnok
Cassie Cage Variation: Brawler
Corrupted Shinnok Variation: None
Stage: Infected Jinsei Chamber
Reward: Finishing the final fight unlocks Shinnok.