Play Doodle Devil, the follow-up to Doodle God. Combine elements to make a total of 100 of them.

This guide is not as long as it looks. It's broken down into the following sections:

1) Medals list
2) Starting Elements
3) Full List of Elements, ordered by element group (in case you need to find one quickly)
4) Full List of Reactions, in the order in which I found them. If you do what I did, you'll get to the end eventually.
5) Full List of Reactions, sorted by element group (in case you want to figure out how to get the one you're missing). Duplications are included for the sake of completeness.
6) Fastest Route to Completion (75 reactions) (in case you just want to burn through it as fast as possible)
7) Reactions not included in the Flash version, but present in the Android version (you know, in case you're curious what you're missing)

What that means is there's a bunch of duplication, and that on purpose. The way you should use this guide is to find the part that matches your playstyle and goals (i.e. if you just want to know what's there and figure out how to get it on your own you'd go to the full list of elements and stop there) and refer to that part of the guide.

If you find a reaction not listed in this guide, let me know and I will add it.

Medals (5 for 195 points):
Half Game (10) - Half Of All Elements Discovered

Nuclear Bomb (10) - Nuclear Bomb Discovered

7 Mortal Sins (25) - 7 Mortal Sins. Note that this really just means any 7 sins discovered, not the actual 7 mortal ones.

All Game (50) - All Element(sic) Discovered

All Game With No Hints (100) - All Elements Discovered With No Hints (actually, you can [have] ONE hint)

Starting Elements:
Nature: Air
Nature: Earth
Nature: Fire
Nature: Water

Animals: Beast

Evil: Chaos
Evil: Darkness

Good: Light
Good: Order

Humans: Human
Humans: Man
Humans: Woman

Plants: Apple

Full List of Elements:
Nature:
Air (Starting Element), Ash, Earth (Starting Element), Energy, Fire (Starting Element), Lava, Metal, Steam, Stone, Water (Starting Element)

Animals:
Beast (Starting Element), Dove, Egg, Fish, Rat, Snake, Worm

Evil:
Chaos (Starting Element), Darkness (Starting Element), Death, Diseases, Inferno, Magic, Sect, Sin, Suffering

Good:
Angel, Friendship, Heavens, Life, Light (Starting Element), Order (Starting Element), Prayer, Religion, Soul

Technology:
A.I., Car, Cellphone, Computer, Cyborg, Electricity, Internet, Radio Wave, Robot, TV

Humans:
Blood, Corpse, Food, Human (Starting Element), Lawyer, Politician, Man (Starting Element), Sex, Witch, Woman (Starting Element)

Monsters:
Cthulhu, Demon, Dragon, Frankenstein, Hydra, Vampire, Werewolf, Zombie

Plants:
Apple (Starting Element), Coffee, Grass, Mushroom, Seeds, Tobacco, Tree

Sins:
Envy, Gluttony, Greed, Heresy, Lust, Murder, Pride, Sloth, Theft, Wrath

Society:
Atheism, Book, Censored, Copyright, Gambling, Knowledge, Money, Psychology, War, Work

Tools:
Acid, Bomb, House, Mechanism, Nuclear Bomb, Oil, Poison, Sulfur, TNT, Weapon

Reactions in the order in which I found them (following this will get you through the game with all medals):
Human + Apple = Knowledge + Sin (the one that kicks it all off)
Human + Beast = Werewolf
Woman + Man = Sex + Life
Man + Man = Friendship
Fire + Water = Steam
Air + Fire = Energy
Earth + Fire = Lava
Lava + Water = Stone + Steam
Stone + Fire = Metal
Lava + Air = Stone

Energy + Metal = Electricity
Darkness + Beast = Demon
Demon + Human = Soul + Corpse
Light + Life = Angel
Soul + Light = Heavens
Fire + Human = Corpse + Suffering
Fire + Man = Corpse + Suffering
Fire + Corpse = Ash
Human + Stone = House
Human + Metal = Weapon

Energy + Darkness = Death
Fire + Death = Inferno
Inferno + Air = Sulfur
Water + Sulfur = Acid
Acid + Human = Suffering
Weapon + Beast = Food + Blood
Blood + Human = Vampire
Vampire + Human = Vampire + Vampire
Werewolf + Human = Werewolf + Werewolf
Apple + Earth = Seeds

Earth + Seeds = Tree + Mushroom + Grass
Seeds + Energy = Coffee
Fire + Tree = Ash
Grass + Fire = Tobacco
Fire + Tobacco = Diseases
Human + Weapon = Blood
Beast + Diseases = Rat
Earth + Knowledge = Oil
Inferno + Soul = Suffering
Human + Knowledge = Book

Fire + Book = Ash
Oil + Acid = TNT
TNT + Metal = Bomb
Electricity + Air = Radio Wave
Corpse + Electricity = Frankenstein
Rat + Air = Dove
Beast + Water = Fish
Fire + Beast = Ash
Tobacco + Beast = Death
Demon + Energy = Magic

Magic + Stone = Egg
Magic + Man = Worm
Egg + Worm = Snake
Woman + Magic = Witch
Fire + Witch = Ash + Soul + Heavens
Snake + Beast = Hydra
Magic + Egg = Dragon
Demon + Water = Cthulhu
Human + Dragon = Ash
Sin + Sex = Lust

Sin + Food = Gluttony
Human + Weapon = Blood
Sin + Sin = Pride
Sin + Corpse = Murder
Human + Murder = Corpse + Inferno
Sin + Weapon = Wrath
Demon + Order = Copyright
Copyright + Knowledge = Money
Sin + Money = Greed + Theft
Bomb + Mushroom = Nuclear Bomb (Mushroom Cloud, get it?)

Man + Money = Work
Human + Copyright = Lawyer
Sin + Work = Sloth
Sin + Greed = Envy
Human + Angel = Prayer
Human + Prayer = Heavens + Religion
Sin + Religion = Heresy
Heresy + Human = Psychology + Atheism
Metal + Work = Mechanism
Human + Sloth = Car

Human + Greed = Gambling
Human + Pride = Politician
Demon + Mechanism = TV
TV + Book = Computer
Computer + Computer = Internet
Life + Computer = AI
Mechanism + Computer = Robot
AI + Robot = Cyborg
Radio Wave + Computer = Cellphone
Heresy + Religion = Sect

Sex + Mechanism = Censored
Politician + Pride = War
Lawyer + Money = Greed
Life + Corpse = Zombie
Tobacco + Coffee = Poison

Full list of reactions sorted by element grouping:
Note that I've included which group each element is found in if not in the current group.

Nature:
Fire + Water = Steam
Air + Fire = Energy
Earth + Fire = Lava
Lava + Air = Stone
Lava + Water = Stone + Steam
Stone + Fire = Metal
Air + Fire = Energy
Fire + Corpse (humans) = Ash
Fire + Tree (plants) = Ash
Fire + Book (society) = Ash
Fire + Beast (animals) = Ash
Human (humans) + Dragon (monsters) = Ash
Fire + Witch (humans) = Ash + Soul + Heavens

Animals:
Beast + Diseases (evil) = Rat
Rat + Air (nature) = Dove
Beast + Water (nature) = Fish
Magic (evil) + Stone (nature) = Egg
Magic (evil) + Man (humans) = Worm
Egg + Worm = Snake

Evil:
Human (humans) + Apple (nature) = Knowledge + Sin
Energy (nature) + Darkness = Death
Tobacco (plants) + Beast (animals) = Death
Fire (nature) + Death = Inferno
Human (humans) + Murder (sins) = Corpse + Inferno
Acid (tools) + Human (humans) = Suffering
Fire (nature) + Human (humans) = Corpse + Suffering
Fire (nature) + Man (humans) = Corpse + Suffering
Fire (nature) + Tobacco (plants) = Diseases
Inferno + Soul (good) = Suffering
Demon + Energy (nature) = Magic
Heresy (sins) + Religion (good) = Sect

Good:
Woman (humans) + Man (humans) = Sex + Life
Man (humans) + Man (humans) = Friendship
Demon (monsters) + Human (humans) = Soul + Corpse
Light + Life = Angel
Soul + Light = Heavens
Fire (nature) + Witch (humans) = Ash + Soul + Heavens
Human (humans) + Angel = Prayer
Human (humans) + Prayer = Heavens + Religion

Technology:
Energy (nature) + Metal (nature) = Electricity
Electricity + Air (nature) = Radio Wave
Human (humans) + Sloth (sins) = Car
Demon (evil) + Mechanism (tools) = TV
TV + Book (society) = Computer
Computer + Computer = Internet
Life (good) + Computer = AI
Mechanism (tools) + Computer = Robot
AI + Robot = Cyborg
Radio Wave + Computer = Cellphone

Humans:
Woman + Man = Sex + Life
Demon (evil) + Human = Soul + Corpse
Fire (nature) + Human = Corpse + Suffering
Fire (nature) + Man = Corpse + Suffering
Human + Weapon (tools) = Blood
Weapon (tools) + Beast (animals) = Food + Blood
Woman + Magic (evil) = Witch
Human + Murder (sins) = Corpse + Inferno
Human + Copyright (society) = Lawyer
Human + Pride (sins) = Politician

Monsters:
Darkness (evil) + Beast (animals) = Demon
Blood (humans) + Human (humans) = Vampire
Vampire + Human (humans) = Vampire + Vampire
Human (humans) + Beast (animals) = Werewolf
Werewolf + Human (humans) = Werewolf + Werewolf
Corpse (human) + Electricity (technology) = Frankenstein
Snake (animals) + Beast (animals) = Hydra
Magic (evil) + Egg (animals) = Dragon
Demon (monsters) + Water (nature) = Cthulhu
Life (good) + Corpse (humans) = Zombie

Plants:
Apple + Earth (nature) = Seeds
Earth (nature) + Seeds = Tree + Mushroom + Grass
Seeds + Energy (nature) = Coffee
Grass + Fire (nature) = Tobacco

Sins:
Sin (evil) + Sex (humans) = Lust
Sin (evil) + Food (humans) = Gluttony
Sin (evil) + Sin (evil) = Pride
Sin (evil) + Corpse (humans) = Murder
Sin (evil) + Weapon (tools) = Wrath
Lawyer (humans) + Money (society) = Greed
Sin (evil) + Money (society) = Greed + Theft
Sin (evil) + Work (society) = Sloth
Sin (evil) + Greed = Envy
Sin (evil) + Religion (good) = Heresy

Society:
Human (humans) + Apple (nature) = Knowledge + Sin
Human (humans) + Knowledge = Book
Demon (evil) + Order (good) = Copyright
Copyright + Knowledge = Money
Man (humans) + Money = Work
Heresy (sins) + Human (humans) = Psychology + Atheism
Human (humans) + Greed (sins) = Gambling
Sex (humans) + Mechanism (tools) = Censored
Politician (humans) + Pride (sins) = War

Tools:
Human (humans) + Stone (nature) = House
Human (humans) + Metal (nature) = Weapon
Inferno (evil) + Air (nature) = Sulfur
Water (nature) + Sulfur = Acid
Earth (nature) + Knowledge (society) = Oil
Oil + Acid = TNT
TNT + Metal (nature) = Bomb
Bomb + Mushroom (nature) = Nuclear Bomb (Get it? Mushroom cloud?)
Tobacco (plants) + Coffee (plants) = Poison
Metal (nature) + Work (society) = Mechanism

Fastest route to completion (75 reactions):
Human + Apple = Knowledge + Sin (the one that kicks it all off)

Getting started with multiple elements fast:
Woman + Man = Sex + Life
Man + Man = Friendship
Fire + Human = Corpse + Suffering
Earth + Fire = Lava
Lava + Water = Stone + Steam
Apple + Earth = Seeds
Earth + Seeds = Tree + Mushroom + Grass
Stone + Fire = Metal
Human + Stone = House
Human + Metal = Weapon
Weapon + Beast = Food + Blood

Finishing off Nature and Good:
Air + Fire = Energy
Darkness + Beast = Demon
Demon + Energy = Magic
Woman + Magic = Witch
Fire + Witch = Ash + Soul + Heavens
Light + Life = Angel
Human + Angel = Prayer
Human + Prayer = Heavens + Religion
Demon + Order = Copyright
Copyright + Knowledge = Money
Energy + Metal = Electricity

Now the Sins:
Sin + Money = Greed + Theft
Sin + Religion = Heresy
Heresy + Human = Psychology + Atheism
Sin + Sex = Lust
Sin + Food = Gluttony
Sin + Sin = Pride
Sin + Corpse = Murder
Human + Murder = Corpse + Inferno
Sin + Weapon = Wrath
Man + Money = Work
Sin + Work = Sloth
Sin + Greed = Envy

Now everything else, grouped together, starting with Plants:
Seeds + Energy = Coffee
Grass + Fire = Tobacco

Animals:
Magic + Man = Worm
Magic + Stone = Egg
Egg + Worm = Snake
Fire + Tobacco = Diseases
Beast + Diseases = Rat
Rat + Air = Dove
Beast + Water = Fish

Monsters:
Human + Beast = Werewolf
Blood + Human = Vampire
Corpse + Electricity = Frankenstein
Snake + Beast = Hydra
Magic + Egg = Dragon
Demon + Water = Cthulhu
Life + Corpse = Zombie

Evil:
Energy + Darkness = Death
Heresy + Religion = Sect

Tools:
Tobacco + Coffee = Poison
Inferno + Air = Sulfur
Water + Sulfur = Acid
Earth + Knowledge = Oil
Oil + Acid = TNT
TNT + Metal = Bomb
Bomb + Mushroom = Nuclear Bomb (MEDAL GET MUSHROOM CLUOUD!)
Metal + Work = Mechanism

Humans:
Human + Copyright = Lawyer
Human + Pride = Politician

Society:
Human + Knowledge = Book
Human + Greed = Gambling
Sex + Mechanism = Censored
Politician + Pride = War

Technology:
Electricity + Air = Radio Wave
Human + Sloth = Car
Demon + Mechanism = TV
TV + Book = Computer
Computer + Computer = Internet
Life + Computer = AI
Mechanism + Computer = Robot
AI + Robot = Cyborg
Radio Wave + Computer = Cellphone

Reactions not included in the Flash version, but present in the Android version:
Animals:
Bat = Vampire + Air
Piranha = Fish + Weapon
Wolf = Beast + Wrath

Evil:
Styx = Water + Death

Good:
Resurrection = Soul + Corpse

Monsters:
Cerberus = Beast + Death
Mutant = Human + Darkness