Website that's tell how to unlock rewards

Looking for a website that tells me how to unlock an those rewards. Costumes, emotes, powers.

I recently did the Great Escape event and did by et rewarded the ghoul emote. We did everything correct. I sent a report and the GM says I probably did not participate in the event enough. I told him that it allowed ne to pick other rewards except the emote. Then he tells me that I probably did not do enough for tr specific reward. I ask him if theres anyway to track how to unlock something......

AND HE HAD THE AUDACITY to tell me in the email "Your best bet would be trial and error." are you kidding me? Is that how you talk to a customer who is paying money for your GM job!

ParagonWiki is your friend.

You can get info there for:
Emotes
Badges
Accolade Powers: (Hero/Villain)
Unlockable Costumes
Unlockable Weapons
Temporary Powers

For the Great Escape event...
It really is "trial and error". The rewards for that event are based on participation. The more times you do it, the more you learn how the event works and can anticipate the next objective and not fall behind (there are 2 distinct ways to do this event, each with it's own emote reward).
On the other hand, some players have reported issues earning those rewards on certain characters. We still aren't sure how teams, pet damage, or running auras on a support toon affect the rewards because some people earn it without a problem, while others have constant issues. That's where "trial and error" come in again. If it's important for you to earn it, just keep trying and work hard until you get it. Don't be afraid to ask for help.

Regarding the GM response:
The GMs are known to NOT give us direct or specific information on how certain rewards are earned. Figuring it out on our own is supposed to be part of the game. Once in a while we'll get one that makes a statement implying how something works, but for the most part... if it's not directly stated in the game, we have to rely on other player experience (ParagonWiki) for that type of information.

Good Luck!

Might be unrelated, but I would like to add: Unlockable Contacts

edit: Television is your friend.