See my guide under the "Master of the Worlds" achievement for a full guide on how to complete all 4 Episodes. :] Happy gaming!
Also note that you will technically finish Episode 1 before all combinations in the list are completed, but even though you technically finished the episode, you must make every combination in the list in order to be able to complete Episode 2, due to there being missing elements. Episode 1 is the only episode that contains more combinations than what is needed to complete the level.
Episode 1
earth + fire = lava
air + earth = dust
air + fire = energy
energy + air = storm
fire + dust = ash
lava + air = stone
fire + stone = metal
water + stone = sand
energy + metal = electricity
water + air = steam
metal + steam = boiler
fire + sand = glass
water + earth = swamp
fire + water = alcohol
swamp + sand = clay
swamp + energy = life
water + life = weeds
swamp + life = bacteria
swamp + weeds = moss
earth + moss = grass
swamp + grass = reed
water + bacteria = plankton
life + sand = seeds
life + ash = ghost
life + stone = egg
egg + earth = dinosaur
dinosaur + fire = dragon
air + egg = bird
swamp + moss = fern
clay + life = golem
golem + life = human
human + fire = corpse
life + corpse = zombie
zombie + corpse = ghoul
human + energy = wizard
wizard + energy = demigod
seed + earth = tree
human + metal = tools
metal + tools = weapons
weapons + man = hunter
hunter + weapons = warrior
warrior + dragon = hero & blood
blood + human = vampire
fire + clay = bricks
tools + reed = paper
bird + hunter = meat + feather & blood
tree + tool = wood
feather + paper = book
swamp + bacteria = worm & sulfur
tree + fire = ash + ash & coal
coal + boiler = steam-engine
sand + worm = snake
snake + water = fish
water + coal = oil
plankton + fish = whale
snake + tools = poison
poison + weapon = poisoned weapon
poisoned weapon + human = assassin
wood + tool = wheel
earth + tools = field
field + seeds = wheat
wheat + stone = flour
flour + water = dough
dough + fire = bread
bread + alcohol = beer
sand + egg = turtle
swamp + egg = lizard
wood + wheel = cart
cart + steam engine = locomotive
bird + fire = phoenix
lizard + earth = beast
beast + vampire = werewolf
worm + earth = beetle
beetle + sand = scorpion
wood + water = boat
cart + beast = chariot
hunter + beast = meat, wool & blood
human + clay = ceramics
human + stone = hut
stone + plankton = shell
shell + stone = limestone
limestone + clay = cement
tools + wool = fabric
human + beast = domesticated animal
life + tree = treant
weeds + earth = mushroom
water + cement = concrete
concrete + bricks = house
fish + beast = dolphin
wood + boat = ship
oil + cart = car
car + air = airplane
fabric + human = clothes
air + worm = butterfly
storm + bird = thunderbird
glass + house = skyscraper
domestic animal + grass = milk & fertilizer
limestone + fertilizer = saltpeter
saltpeter + sulfur = gunpowder
weapon + gunpowder = firearm
ship + fabric = frigate
ship + steam engine = steamship