| Achievement | How to unlock
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| America's Newest Legacy | Complete America's Newest Legacy's story challenge to unlock the variant. (Secret)
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| Battle Tested | Win a battle.
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| Challenge Accepted | Defeat all core game Villains on Challenge Mode.
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| Compounded Ether Fist | Variety is the spice of pain! Deal 100 damage of each type across all battles.
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| Cosmic Omnitron | Complete Cosmic Omnitron's story challenge to unlock the variant. (Secret)
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| Dark Watch NightMist | Complete Dark Watch NightMist's story challenge to unlock the variant. (Secret)
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| Dark Watch Setback | (Secret)
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| Extreme Hostage Situation | This IS a card game, right? Defeat any Villain without a hero card entering play the entire battle.
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| Flawless Victory | Achieve victory without a scratch. Win a battle with all Heroes at full HP.
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| Freedom Six Unity | Completed Freedom Six Unity's story challenge to unlock the variant. (Secret)
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| Freedom Six Wraith | Complete Freedom Six Wraith's story challenge to unlock the variant. (Secret)
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| G.I. Bunker | Complete G.I. Bunker's story challenge to unlock the variant. (Secret)
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| HAKA CRUSH | Unleash a large barrage. Deal 20 damage or more in a single attack.
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| Infection | Spread the love of Sentinels online. Play a multiplayer game with Handelabra Games, Greater Than Games, or someone who has.
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| K.N.Y.F.E. Rogue Agent | (Secret)
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| Mad Bomber Blade | Complete Mad Bomber Blade's story challenge to unlock the variant. (Secret)
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| Medic! | Did you bring the band-aids? Restore 200 HP to hero targets across all battles.
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| Mobbed by Paparazzi | It can make you feel so powerless. Defeat any Villain without using powers the entire battle.
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| Omnitron-U | (Secret)
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| Prime Wardens Argent Adept | (Secret)
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| Prime Wardens Captain Cosmic | (Secret)
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| Prime Wardens Fanatic | (Secret)
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| Prime Wardens Haka | (Secret)
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| Prime Wardens Tempest | (Secret)
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| Protector of Worlds | Win a battle in each core game Environment.
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| Redirection Misdirection | Who are you even aiming at? Redirect a single instance of damage at least 5 times.
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| Rook City Wraith | Complete Rook City Wraith's story challenge to unlock the variant. (Secret)
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| Santa Guise | (Secret)
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| Settle the Scores | You won't get away with it this time! Defeat 10 Nemeses with the nemesis dealing the final blow.
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| Skinwalker GloomWeaver | Complete Skinwalker GloomWeaver's story challenge to unlock the variant. (Secret)
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| Spite: Agent of Gloom | Complete Spite: Agent of Gloom's story challenge to unlock the variant. (Secret)
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| Termi-Nation Absolute Zero | (Secret)
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| Termi-Nation Bunker | (Secret)
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| Termi-Nation Unity | (Secret)
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| That was Close! | Win a battle by the skin of your teeth - a single hero standing, with only 1 HP remaining.
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| The Adamant Sentinels | (Secret)
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| The Eternal Haka | Complete The Eternal Haka's story challenge to unlock the variant. (Secret)
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| The Hero We Deserve | Defeat all core game Villains on Advanced.
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| The Hero We Need | Defeat all core game Villains.
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| The Hunted Naturalist | (Secret)
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| The Scholar of the Infinite | Complete The Scholar of the Infinite's story challenge to unlock the variant. (Secret)
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| The Super Scientific Tachyon | Complete The Super Scientific Tachyon's story challenge to unlock the variant. (Secret)
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| The Ultimate Hero | Defeat all core game Villains on Ultimate Mode.
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| Xtreme Prime Wardens Argent Adept | (Secret)
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| Xtreme Prime Wardens Captain Cosmic | (Secret)
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| Xtreme Prime Wardens Fanatic | (Secret)
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| Xtreme Prime Wardens Haka | (Secret)
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| Xtreme Prime Wardens Tempest | (Secret)
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