Item description:

Once you resign & load the save, you will have an autosave, & a manual save, use the manual save stating, "Arcadia for Amateurs IV 82.2%" go over to this location.

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You will find Albert Mason, trying to takes photos of an Eagle. Once he falls off the edge & is thinking over the lot of trouble he's been through the trophy will pop directly after. The entire mission is a cutscene so all you have to do is ride to him & watch/skip the cutscene. 4-2 below, is now irrelevant. But mainly for fun useful information. About the EU save, this was my first attempt at trying to make my own US save into EU. Therefore, if I messed it up, I am sorry. But it should work exactly the same. Click the photo above for direct download.

4 - 2: Lot of details for this trophy, incase anyone is wondering *GAME SPOILERS*:
Spoiler:
There are a total of 26 strangers which appear throughout the course of the game. For this achievement you will need to complete 10 multi-part stranger stories. Strangers which only have a single encounter do not count for this achievement.

Strangers appear on the map as a white dot with a question mark in the middle. Some appear automatically via story progression, whilst others will not appear until you are within a certain distance of their position. The following is a list of all strangers and the chapter which they unlock. If for some reason the trophy doesn't show, you can go try the ones without the ~ or the "Can do." beside them & see if those pop the trophy. Although you'll be doing missions I - V or however many is with that strand.

Strangers highlighted in bold will add progression towards this achievement/trophy, the ones with ~ by them, means those are the missions i've done:

Chapter 2
~ The Noblest of Men, and a Woman (Valentine)
All That Glitters (West of Flatneck Station)
~ The Smell of the Grease Paint (Van Horn Trading Post)
~ Arcadia for Amateurs (South-east of Strawberry) - in-progress, part V is where you will earn the trophy.
Fundraiser (Saint Denis) *
American Dreams (Triggered by finding 3 map pieces)
A Fine Night For It (Triggered by a random encounter in the Bayou at night)
Geology for Beginners [Unlocks 'Rock Carvings' collectables] (North-west of Strawberry) (Collectibles)
A Test of Faith [Unlocks "Dinosaur Bones" collectables] (North-east of Flatneck Station) (Collectibles)
Smoking and other Hobbies [Unlocks 'Cigarette Cards' collectables] (Flatneck Station) (Collectibles)

Chapter 3
~ He's British, of Course (South of Emerald Ranch)
A Fisher of Fish [Unlocks 'Legendary Fish' collectables] (North side of Flat Iron Lake) (Collectibles)
~ The Iniquities of History (Rhodes)
No Good Deed (Rhodes)

Chapter 4
~ Oh, Brother (Valentine)
~ The Ties That Bind Us (Rhodes)
~ A Bright Bouncing Boy (Saint Denis)
The Mercies of Knowledge (Saint Denis) - Can do.
~ The Artist's Way (Saint Denis)
Help a Brother Out (Saint Denis) **
Duchesses and other Animals [Unlocks 'Exotics' collectables] (Saint Denis) (Collecting Bird Feathers)
Idealism and Pragmatism for Beginners (Saint Denis) - Can do.

Chapter 5
The Wisdom of the Elders (West of Van Horn Trading Post) - Can do.
The Widow of Willard's Rest (Willard's Rest, North-east of the map) *

Chapter 6
~ The Veteran (O' Creagh's Run, North of Emerald Ranch)

Epilogue 1
The American Inferno, Burnt Out (West of Blackwater) - Can do.

* missions will be unavailable after chapter 6.
** Also an Honor Mission required for 100% completion.