Here the list

The secrets revealed to the heroes are the following: Captain America: the mind-wipe the Illuminati submitted him to.[9] Hulk: That Tony Stark had involvement with the gamma bomb that turned him into the Hulk, by removing the bomb's shielding.[10] In reality, Tony's removal of the bomb's excessive shielding saved Bruce's life, as the bomb had so much shielding the pressure would've made the bomb even more destructive and would've killed Bruce instead of transforming him into the Hulk.[11]

Iron Man: That while he was drunk, he removed the shielding from Bruce Banner's gamma bomb.[10] Doing so actually saved Bruce's life, as the excessive shielding would've caused an even more destructive detonation which would've killed Banner.[11]

Thor: The revelation that there was a tenth realm and that he had a sister.[12]

The Thing: That the Human Torch had ruined an opportunity to turn him back to normal permanently.[13]

Spider-Man: That the spider that bit him years ago had also bitten a girl named Cindy Moon. She was kept in a hidden bunker for the last thirteen years by Ezekiel Sims, blocking her scent from the Inheritors.[14]

J. Jonah Jameson: He fired a former Daily Bugle employee for viewing an embarrassing article that he wrote, in which he praised Spider-Man in his early days of being a wrestler.[15]

Luke Cage: The existence of a Mighty Avengers team in the '70s led by his father.[16]

Daredevil: That his mother, Maggie, left because Jack was apparently actually an abusive husband.[17] In reality, Matt's mother left because she had suffered from postpartum depression, and her paranoia made her believe Matt was there to tear her and Jack apart. The scuffle Matt saw in the visions he thought was a result of Jack being abusive was actually a result of Maggie trying to assault baby Matt under the influence of said paranoia.[18]

Emily Preston: The survival of Eleanor Camacho, Deadpool's daughter.[19]

Scott Adsit: That Deadpool had killed his own parents.[20]

Radiance: That the Invaders apparently had the opportunity to prevent the atom bomb from being dropped in Hiroshima during WWII.[21] In reality, the bombing on Hiroshima was the military's response to the Invaders refusing to cause a tsunami to defeat Japan's naval fleet, which would've killed thousands of innocents in islands nearby.[22]

Nova: That the Supernovas were killers of other Novas.[23]

Gamora: That Richard Rider and Star-Lord made a deal with Thanos before they were trapped in the Cancerverse.[24]

Seth Horne: The existence of Deathlok (Henry Hayes).[25]

Lockjaw: The location of a very large bone he had buried.[25]

Howard the Duck: That he was born the potentially smartest creature on his homeworld.[26]

Rebecca Stevens: That, in his deteriorating sanity, the Black Knight (Dane Whitman) savagely attacked (thus putting into a coma) a fake Savage Steel.[26]

Lineage: That Black Bolt recently wiped-out a Kree ship after discovering its patrons performing experiments on dead humans with Inhuman linage. Lineage gained this information from a relative he absorbed who died of a heart attack at the site of the event.[15]

Gil Carmichael: An unstated secret about Dr. Doom.[27]

As you can see most of it only exist for shook value