Back to the Future: The Game

This trophy is story related and cannot be missed. This will unlock after convincing Trixie to help you take down Kid Tannen.

The path towards obtaining Trixie's help is to start off by asking her about her relationship with Kid.

Say: "What's a nice girl like you...", followed by "Why do you stay with Kid?" and then "Insurance Policy?". After talking to you she will reveal her "interest" in Artie. Head over to Zane and ask him about the caricatures. Now equip your picture of George and interact with Zane to have him draw a charicature that looks like Artie. Head outside and walk to the center of town to show Einstien Artie's Pipe. Einstein will lead you to Artie, who will then follow you and Doc to the Flophouse. Tell Doc to send Artie to Trixie. Then head inside the speakeasy and tell Trixie that Artie is waiting outside for her. Trixie will exit, you will hear gunshots, and Trixie will return. Now ask her these questions in the following order:

--"What happened out there?"
--"Tell me what happened!"
--"Don't destroy the evidence!"

Now exit the speakeasy and examine the pool of blood found and listen to Kid talk about what happened. Re-enter the speakeasy and Zane will present you with a caricature of George, which conveniently looks exactly like Artie. Equip the new caricature and walk over to the other side of the bar near Officer Parker and place the caricature on the wall. Walk over to Trixie and say: "Look who made the Wall of Fame!". Trixie will be so upset about Arthur's alleged death and will agree to help you with Kid, triggering your trophy!

See the walkthrough located under the "Kid Restraint" trophy for more info.