This trophy sucks in general. It sucks from a thematic design perspective.
The Trophy, for this and all similar 'types' of trophies, should be: Completed Companion_Xyz's Personal Quest! Then leave the how, what and why of the quest to the player so that their choice actually matters.
By rewarding certain choices, by nudging players down certain paths, I feel that the general spirit of having multiple paths through a quest is done an injustice.
As a long time player of RPG's (since back in the early days of first and second addition d&d and ad&d respectively) I've never liked reinforcing certain behaviors over others in players. It cheapens the element of choice and devalues the spirit of player freedom.
