Originally Posted by IDiivil
Slight Spoiler Warning:
My achievement popped after I brought the troll back to the other troll in act 2... You need to actually save the troll in act 1, though. You have to solve the full quest line as opposed to just leaving him down there.
Did you kill the troll that attacks you in chapter 2 and still unlocked the achievement ?
Edit: Can you get the friend of trolls achievement on Roche's path ?
Because I read that the quest for the two trolls in chapter 2 is available only on Iorveth's path.