The following is an alphabetically sorted list of all heros with their respective awakenings. I will try to keep this up to date as best I can, but due to my lack of most of the legendaries, I'd appreciate anyone who'd take the time to comment on any missing information. Considering the length of the list I'd recommend Ctrl + F if you are looking for a specific hero, as scrolling will take a while if it comes late in the alphabet.

The list has now been expanded to include Budo heros and Peltrast. It is currently missing:

Peltrast - Ice and Fire.

Hero: Agholor
Ice Awakening: Every other basic attack now reduces the target's Magical Defense by 25% for 3 seconds.
Fire Awakening: Every other basic attack now reduces the target's Physical Defense by 25% for 3 seconds.

Hero: Akanth
Ice Awakening: Siphoning Roots now additionally cleanses all debuffs currently applied to Akanth.
Fire Awakening: Siphoning Roots additionally grants Akanth 300% Life Steal for 8 seconds.

Hero: Ariadne
Ice Awakening: Permanently gains 20% Team Cooldown Reduction. (purge immune)
Fire Awakening: The first time Hymn of the Muses is cast, all allies gain 17.6% Basic Attack Speed for 6 seconds.

Hero: Astrid
Ice Awakening: Astrid now reduces all enemies Critical Damage Bonus by 25%. (cleanse immune)
Fire Awakening: Astrid now reduces all enemies Critical Strike Chance by 8%.

Hero: Atalanta
Ice Awakening: When Atalanta deals a critical hit, she heals all allies for 5.5K health.
Fire Awakening: Upon landing a critical strike, all allies gain 60 Magical Defense for 8 seconds. (stackable)

Hero: Atlas
Ice Awakening: Tide of War now additionally reduces Basic Attack Damage by 30% for 10 seconds.
Fire Awakening: Grants all allies 120 Magical Penetration. (purge immune)

Hero: Boryxion
Ice Awakening: Upon reaching 15% health. heals himself for 50K health.
Fire Awakening: Gaia's Hammer now additionally reduces Magical Defense by 40% to all enemies hit for 6 seconds.

Hero: Briarus
Ice Awakening: Briarus grants all allies 25% Critical Damage Bonus.
Fire Awakening: When Briarus critically hits, he gains 20% Life Steal for 4.5 seconds. (stackable)

Hero: Demetra
Ice Awakening: Serrated Arrowheads now stuns enemies hit for 2 seconds.
Fire Awakening: Wildwood Sharpshot now burns her primary target, dealing 6K Physical Damage every second for 3 seconds.

Hero: Drozho
Ice Awakening: Each basic attack has a 35% chance to increase the Magical and Physical Defense of the most wounded ally by 25% for 10 seconds. (non-stackable)
Fire Awakening: Every other basic attack applies mortal wounds, reducing healing by 100% for 3 seconds.

Hero: Eryx
Ice Awakening: Eryx permanently gains 30% Critical Damage Bonus. (purge immune)
Fire Awakening: For every 30% Health lost, Eryx gains 160 Physical Defense for 12 seconds. (stackable)

Hero: Finn
Ice Awakening: When health falls below 50%, Finn gains a 60K Health Shield.
Fire Awakening: While above 50% health, Finn gains 17.6% Basic Attack Speed.

Hero: Gadrus
Ice Awakening: Tyrant's Predation now additionally applies mortal wounds to enemies, reducing all healing by 50% for 9 seconds.
Fire Awakening: Grants all allies 150% Physical Ability Power for 10 seconds at the start of battle.

Hero: Goruk
Ice Awakening: Tooth for Tooth now grants Goruk 50% Physical Defense for 5 seconds.
Fire Awakening: Goruk permanently gains 35% Life Steal. (purge immune)

Hero: Hadrian
Ice Awakening: Polybolos Punch now additionally grants Hadrian 50% Critical Damage Bonus for 8 seconds.
Fire Awakening: Polybolos Punch now burns  the target, dealing 5.5K Physical Damage every second for 4 seconds.

Hero: Hiromi
Ice Awakening: Following 4 basic attacks, the next attack reduces the target's Physical Defense by 25% for 5 seconds.
Fire Awakening: Following 4 basic attacks, the next attack deals a bonus of 3K True Damage.

Hero: Imbrus
Ice Awakening: Following 3 basic attacks, the next attack deals 16K Magical Damage and grants the most damaged ally a 16K Health Shield for 10 seconds.
Fire Awakening: Eye of the Erudite additionally deals 12K Magical Damage to surrounding enemies and heals surrounding allies for 12K health.

Hero: Iola
Ice Awakening: Upon losing health for the first time, stuns the lowest health enemy for 6 seconds.
Fire Awakening: Venom of Souls deals an initial burst of 30K Magical Damage.

Hero: Ixion
Ice Awakening: Each ally death grants Ixion 40% Basic Attack Damage until battle ends. (stackable)
Fire Awakening: Litany of Scorn now purges all buffs from the neareest enemy to the primary target.

Hero: Jhaqor
Ice Awakening: Runestone Divination now purges one buff from all enemies.
Fire Awakening: Runestone Divination now purges all buffs from the most buffed enemy.

Hero: Jocasta
Ice Awakening: Templar's grace now additionally purges all buffs from enemies hit.
Fire Awakening: Upon dropping below 30% health for the first time, Jocasta returns 2.8K Physical Damage back to ranged attackers for 20 seconds.

Hero: Kahara
Ice Awakening: Kahara permanently gains 35% Magical Ability Power. (purge immune)
Fire Awakening: Upon death. Kahara deals 50K Magical Damage to all enemies around her.

Hero: Konamele
Ice Awakening: While all allies are alive, Konamele gains 20% Physical Defense and Magical Defense.
Fire Awakening: Every basic attack has a 30% chance to steal 20% Magical and Physical Defense for 10 seconds.

Hero: Ku-Tengu
Ice Awakening: Upon landing a critical strike, Ku-tengu grants all other allies 12% Basic Attack Damage for 5 seconds. (non-stackable)
Fire Awakening: Upon landing a critical strike, Ku-tengu gains 35% Basic Attack Damage for 5 seconds. (non-stackable)

Hero: Leandros
Ice Awakening: The first cast of Champion Clash grants all other allies a 20K point Health Shield for 12 seconds.
Fire Awakening: Upon Death, Leandros grants all allies a 26K Health Shield for 14 seconds.

Hero: Magnus
Ice Awakening: The first cast of Electric Smash now stuns affected enemies for 4 seconds.
Fire Awakening: Electric Smash now burns the area around the primary target, dealing 4K Magical Damage every second for 4 seconds.

Hero: Mayar
Ice Awakening: Upon any ally's death, Mayar and all remaining allies gain a 10% Physical Ability Power. (stackable)
Fire Awakening: Full Moon's Affliction additionally stuns targets for 3 seconds.

Hero: Megara
Ice Awakening: Each time Megara loses 30% health, she gains a 40K Health Shield for 10 seconds.
Fire Awakening: Megara gains 60% Movement Speed and 66.7% Attack Speed for 10 seconds at the start of battle.

Hero: Matilda
Ice Awakening: Matilda now periodically deals 2K Magical Damage to enemies around her every 2 seconds.
Fire Awakening: Upon landing a critical strike: Matilda reduces Magical Defense by 60 for 6 seconds to nearby enemies.

Hero: Melchior
Ice Awakening: Following 3 basic attacks, his next attack steals 30% Energy Generation Rate for 3 seconds.
Fire Awakening: Melchior stops all enemies energy generation for 3.5 seconds at the beginning of battle.

Hero: Melita
Ice Awakening: Shattering Call now additionally purges one buff from all enemies hit.
Fire Awakening: The unit initially deployed behind Melita gains 3K bonus Physical Damage on every basic attack.

Hero: Nestor
Ice Awakening: Twinblade Stomp now additionally applies mortal wounds to enemies, reducing all healing by 50% for 16 seconds.
Fire Awakening: Upon dropping below 10% health for the first time, Nestor gains a 80K Health Shield for 10 seconds.

Hero: Nouri
Ice Awakening: Aegis of Splendor additionally reflects 3.2K Magical Damage to all enemies while the barrier persists.
Fire Awakening: Aegis of Splendor additionally grants Nouri 100% Life Steal for 8 seconds.

Hero: Nyx
Ice Awakening: Deviant Shadowbind now stuns the target for 5 seconds and purges all buffs.
Fire Awakening: Nyx permanently gains 1.5K Magical Ability Power. (purge immune)

Hero: Pallas
Ice Awakening: Every 30% health lost, Pallas freezes all enemies Energy Generation for 2.5 seconds.
Fire Awakening: For every 30% health lost, all allies gain 225 Magical Defense for 10 seconds. (non-stackable)

Hero: Peltrast
Ice Awakening: -- information needed --
Fire Awakening: -- information needed --

Hero: Phaidon
Ice Awakening: Upon landing a critical strike, Phaidon gains 10% Basic Attack Damage for 5 seconds. (stackable)
Fire Awakening: Blast Shot now burns the primary target, dealing 5K Physical Damage every second for 4 seconds.

Hero: Phoebe
Ice Awakening: Starts battle with a 14K Health Shield.
Fire Awakening: Starts battle with 60% Magical Ability Power for 15 seconds.

Hero: Rexenor
Ice Awakening: Every Basic Attack now additionally heals the most wounded ally for 2K health.
Fire Awakening: Following 2 basic attacks, the next attack grants a random ally 17.6% Basic Attack Speed for 5 seconds.

Hero: Rhalgo
Ice Awakening: Increases Basic Attack Speed by 25% and reduces Basic Attack Damage by 10%.
Fire Awakening: Each basic attack has a 15% chance to launch an extra magical projectile at the most injured enemy and deal 20K Magical Damage.

Hero: Sagango
Ice Awakening: Permanently sacrifices 15% Magical Defense and Physical Defense for 75% increased Magical Ability Power. (purge and cleanse immune)
Fire Awakening: Curse of Malady additionally applies mortal wounds to all enemies, reducing all healing by 50% for 5 seconds.

Hero: Sarpedon
Ice Awakening: Following 5 basic attacks, Sarpedon's next attack heals himself for 15K health.
Fire Awakening: Soulful Shriek grants Sarpedon 30% Magical Penetration and 25% Basic Attack Speed for 8 Seconds.

Hero: Sejiwan
Ice Awakening: Sejiwan creates an aura around her, increasing allies movement speed by 40%.
Fire Awakening: Sejiwan gains 100% Physical Defense for 12 seconds.

Hero: Sekhmeta
Ice Awakening: Invocation of Ra now reduces enemies Basic Attack Speed by 31% for 10 seconds.
Fire Awakening: Invocation of Ra reduces all affected enemies Magical Defense by 40% for 10 seconds.

Hero: Setsuna
Ice Awakening: Threefold Sword Flourish now permanently reduces the targets Physical Defense by 175. (stackable, cleanse immune)
Fire Awakening: Setsuna starts battle with 25% increased Basic Attack Speed for 15 seconds.

Hero: Sobekos
Ice Awakening: When the first enemy falls, grants all allies 40% Magical Penetration for 20 seconds.
Fire Awakening: Winds of Daybreak increases allies Basic Attack Speed by 33.3% and decreases enemies Basic Attack Speed by 25.9% for 8 seconds.

Hero: Sybil
Ice Awakening: All allies gain 30% Magical Ability Power. (purge immune).
Fire Awakening: Kismet Curse now throws an additional orb to a random enemy burning them, dealing 4K Magical Damage per second for 4 seconds.

Hero: Takeda
Ice Awakening: Upon dropping below 50% health for the first time, Takeda gains 100% Life Steal for 18 seconds.
Fire Awakening: While above 50% health, each critical strike increases Physical Defense by 15% for 10 seconds. (stackable)

Hero: Tethoros
Ice Awakening: Iron Bullwark now returns 1.4K Physical Damage back to each attacker.
Fire Awakening: Every other basic attack deals 3K Physical Damage and reduces the enemies Physical Defense by 100 for 8 seconds. (stackable)

Hero: Thalassa
Ice Awakening: Deathwing Assault now additionally applies mortal wounds to target, reducing all healing by 75% for 18 seconds.
Fire Awakening: Upon landing a critical hit, Thalassa gains 85 Physical Penetration for 10 seconds. (stacking)

Hero: Tiandao
Ice Awakening: Upon an ally death, Tiandao immediately cleanses all allies.
Fire Awakening: Fivefold Tenets of Sol additionally grants all allies 200 Magical Defense for 10 seconds.

Hero: Unomsa
Ice Awakening: Unomsa now reduces all enemies Team Cooldown Reduction by 20% (cleanse immune)
Fire Awakening: Unomsa now reduces all enemies Energy Generation Rate by 20%.

Hero: Xing
Ice Awakening: Ferocious Bite additionally heals Xing for 30K health.
Fire Awakening: Upon dropping below 25% health for the first time, Xing gains a 85K Health Shield for 10 seconds.

Hero: Zeph
Ice Awakening: The first cast of Great White Vortex reduces all enemies Basic Attack Speed by 23.1% for 10 seconds.
Fire Awakening: Great White Vortex now burns all enemies hit, dealing 4K Physical Damage every second for 4 seconds.

Hero: Zhurak
Ice Awakening: Following 4 basic attacks, the next attack grants 35% Life Steal for 8 seconds.
Fire Awakening: Zhurak's first attack reduces the target's Magical and Physical Defense by 40% for 10 seconds.

Hero: Zoe
Ice Awakening: Blade Typhoon now reduces enemies Physical Defense by 30% for 10 seconds.
Fire Awakening: Following 3 basic attacks, the next attack deals 14K Physical Damage in an area around her.