Back to the Future: The Game
60 Achievements
8-10h
Green Gobblin'
Treated Desert Edna to an algae cake.
14.7%
How to unlock the Green Gobblin' achievement in Back to the Future: The Game - Definitive Guide
TlMB0
*Missable* When back at the Expo, after leaving the House of the Future, Trixie will pull the "Hostile Guy" on stage to talk about his algae cakes. While he is there, go back to his booth and steal the box. Now, once you are at Edna's house in the alternate 1931, in order to coax her out of her house, you will need to tell her you brought her something. When she asks what you brought her, open up your menu and equip the algae cakes, and interact with Edna. She will come down and take them, and your trophy will unlock.
For more information, refer to the trophy walkthrough under "The Future isn't Written 
".
Rezidentus
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stratege.ru
Episode 5.
While visiting the exhibition, at one point, Trixie will invite a man onto the stage who will talk about his algae cookies - at this moment, go to the booth where he was standing before and grab the box of cookies. Then, when you find yourself near Edna’s house, in order to lure her outside, you will have to say that you brought her something, when she asks what exactly, select the box of cookies in your inventory and give it to Edna.