What were Stalins achievements?

Answer 1

Well that is kind of a broad question. If you are looking for a simple answer: He is responsible for the industrialization of Russia, as well as turning it into a super power that rivaled the United States. His Soviet Union was responsible for the destruction of Nazi Germany, when they took Berlin in 1945. I suggest you do some research if you want to know more.
Transforming the USSR into a world power thru WW2 and into the 1950's.

Answer 2

Joseph Stalin brought about the industrialization of the Soviet Union. Under his agricultural collectivization policy, he seized land from the peasants, making them serfs again, but this also succeeded in producing an agricultural boom as a result. He produced a Five Year Plan that stabilized Russia's economy and promoted healthcare and the arts. He is best known for stopping Hitler as well as being part of the kickoff of the Cold War.