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The Luna 1 was the first spacecraft to ever reach the moon; it was sent out by the soviets in order to beat the U.S. in the space race.
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The Apollo 11 was the first space flight to successfully have a human land on the moon and travel back to Earth safely.
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The Skylab launched by the U.S. was the first successful space station, having a workshop, a solar observatory, and things that humans need to survive.
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This was the the first time that the U.S. had ever landed a probe onto a planet. Viking
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The voyager 1 arrives at Saturn after 3 years and 2 months, collecting tons of pictures for NASA.