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The Viking went to Mars, it was ment to take pictures and explore the atmosphere. It found volcanoes, lakes and lava.
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The Voyager went to Saturn and Jupiter. It's mission was to explore the rings and moons of those planets. Explored all outer planets, 48 moons and magnetic fields.
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Mission to Jupiter. Went to probe Jupiters atmosphere and it's moons. Came back with close up studies of Ida and Gaspra, craters.
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Mission to Venus. Went to conduct radar images. Came back better understanding volcanoes on venus and its wind erosion
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Mission to Mars. Went to demonstrate key technologies. It was the first explorer to explore the martian surface.
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Mission to Mars. Started the new era of Mars exploration. Discovered signs of past persistent water.
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Mission to Mars. Supposed to be a 90 sol mission. Luckily landed in a small crater, allowed to research with more ease.