Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
One thing about Geralt - he loves to meander. Instead of sitting in an inn near a warm stove, he is always putzing around fields and woods looking for gods-know-what. During one such stroll through the charming environs of Velen, he happened across tracks left by some kind of monster. Though he had no contract to kill any such beast, his witcher heart started racing at once...
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