All the missions, except the prologue, have optional goals that score you at bronze, silver, or gold. Does anyone know if completion of these stack between attempts, or need to be accomplished on a single attempt?
Let's take the Franklin and Lamar mission as an example, which is the first non-prologue mission. There are four optional goals for the mission, but the only one I managed to complete is avoided the aliens (since you race through a move set). If I replay the mission and satisfy the other three goals, but splatter an alien, will the success from the previous run carry forward and give me a gold?