It's not that at all. I unlocked Requital by defeating Villainous Infinitor (and he never flipped, either). My last move was a 22-point Construct Cataclysm (boosted thanks to Parse) that took down Infinitor. We've also seen several different environments (I was in SIlver Gulch, someone else was on a MDP).
Remember how, when we were dealing with XPWCC, we thought it had to do with having one of each Construct type in play? I suspect that may be it this time.
But it appears to be:
Win a game against Villainous Infinitor with base Captain Cosmic on the team. [Something else.]
Aww. And here I was having a grand old time with Lead From the Front / Next Evolution / Dynamic Siphon, building up CC's stuff in play against flipped Heroic Infinitor while my baby slept on my shoulder. It may be an annoying battle that way, but at least I was in no danger. Good job, early unlock folks, and I'll sit back and save my unlock for potential condition testing later...
Infinitor in the Block vs Legacy, Captain Cosmic and Tempest.
Cosmic dealt the final blow with a Construct Cataclysm of 9 constructs, one being destroyed twice thanks to Sustained Influence. Infinitor flipped and every Construct or Manifestation was seen and destroyed at least once.
Heroes - Legacy, Visionary, Fugue State Parse, Captain Cosmic (in that order)
CC did most of the damage, though everyone did some. CC got the final blow, with a Construct Cataclysm of 4 constructs. All of Infinitor's Manifestations were seen and destroyed. NOT all of CC's constructs saw play (I know for a fact that Wounding Buffer did not see play)
My idea for unlock conditions are...
Defeat Infinitor with Captain Cosmic present. CC must get the final blow. No Constructs or Manifestations can be in play at game's end.
Cosmic dealt final blow to Infinitor with Construct Cataclysm and destroyed many of his own Contructs for damage to Infinitor. He dealt a lot of damage over the course of the game but destroyed very few if any manifestations.
It was very early in the morning as I woke up and I had some spare time for 1 game as I fortunately unlocked Requital CC.
If you click on my unlock picture I posted above you will see that it's Xtreme AA turn as I unlocked the variant. I used his base power to destroy a contruct and CC was able to deal 1 damage to 3 targets, which did the final blow. I am pretty sure that I had much more constructs out as Construct Cataclysm wasn't enough to deal the final blow on CC turn and I wanted that all the Autonomous Blades stay for 1 more round in play. Than I had the idea on Xtreme AA turn to destroy a contruct.
I would like to add some more information regarding my unlock. Infintor had to reshuffle his deck, I destroyed each manifestation at least once.
CC had on the first round 5 constructs on the field, I played a lot of them over the course of that game and I am pretty sure each type of construct was played at least once.
There was a Crushing Cage and a Twisted miscreation in play in my unlock. Infinitor at the Block, CC, Legacy & Ra. Killed Infinitor with a 14 point ConCat, 11 Constructs killed. Infinitor shuffled his deck, as he does, and I'm pretty sure every Manifestation got played and popped at least once.
Infinitor vs base CC, grandpa legs, PW fanatic, team leader Tachyon, and XPW AA (all for extra card draw and funnel most powers to CC)
Edit: fought at the Block.
Won with CC using construct cataclysm to deal final blow.
All constructs and manifestations were out of play. Saw all at least once.
Other heroes did kill manifestations, including environment killed at least 1.
No incaps.
CC cycled through deck at least once, so did infinitor.
Much healing was had by grandpa legs, gung-ho, and motivational strike, and cosmic crest.
My guess for unlock conditions:
defeat infinitor with construct cataclysm. Every unique manifestation must have been played and beaten at least once. Every unique construct must have been played and destroyed at least once.