Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
When men sense death's approach, they try to finish all manner of unresolved business. Some write wills, others pay off debts and still others make up with estranged relatives. Nidas, a battle-hardened veteran from Novigrad, wanted to tie off a rather atypical loose end: acquiring the black pearl he had once promised his beloved wife. As he had reached an advanced age, he would not be able to journey to the black pearl beds of Skellige by himself - so he hired the witcher to assist him.
