Answer by taking a quote from the following article:

Saparmurat Atayevich Niyazov (Turkmen: Saparmyrat Ataievich Nyiazov, translit. Saparmyrat Atayewic Nyyazow, [thaparm@'rat a'tajebitS n@'jad@f], spelled Saparmxrat Atayewic Nxyazow between 1992 and 1993 and Saparmyrat Atayewic Nyyazow between 1993 and 1995); 19 February 1940 - 21 December 2006) was a Turkmen politician who served as the leader of Turkmenistan from 1985 until his death in 2006. He was First Secretary of the Turkmen Communist Party from 1985 until 1991 and continued to lead Turkmenistan for 15 years after independence from the Soviet Union in 1991. Turkmen media referred to him using the title "His Excellency Saparmurat Turkmenbasy, President of Turkmenistan and Chairman of the Cabinet of Ministers".

Niyazov became president at the transition of Turkmenistan from a Soviet republic to an independent state. His presidency was characterised by an initial crumbling of the centralised Soviet model that in many respects was unsuited to function as a separate entity; also, there were large amounts of foreign income from gas and petroleum reserves (approximately $2-4 billion as of 2005). There was outside concern about press freedom and to a lesser extent religious rights of minority religious groups. Niyazov made a personal attempt to create a cultural background for the new state of Turkmenistan by writing and promoting the Ruhnama, an autobiography meant to guide the people of Turkmenistan with his ideas and promote native culture (and by extension prohibiting foreign culture). He also took part in creating new holidays with a specific Turkmen nature and introduced a new Latin-based Turkmen alphabet to replace Russian Cyrillic. The Latin Turkmen alphabet consists of: Aa, Bb, Cc, Dd, Ee, Aa, Ff, Gg, Hh, Ii, Jj, Zz, Kk, Ll, Mm, Nn, Nn, Oo, Oo, Pp, Rr, Ss, Ss, Tt, Uu, Uu, Ww, Yy, Yy, Zz. Niyazov became a substitute for the vacuum left by the downfall of the communist system, with his image replacing those of Marx and Lenin. He renamed the town of Krasnovodsk "Turkmenbashi" after himself, and renamed schools, airports and even a meteorite after himself and members of his family. His many, sometimes erratic decrees, and the doting actions of the official Turkmen media gave rise to the clear appearance of a cult of personality. The eccentric nature of some of his decrees, and the vast number of images of the president led to the perception, especially in western countries, of a despotic leader, rich on oil wealth glorifying himself whilst the population gained no benefit. Despite emphasizing a need to move from central planning to a market economy and to a full democracy during his reign, neither plan progressed. Yearly plans set forth by the government and a centralised economy gave little indication of moving away from state-dominated economics, and the dictatorial nature of many of his decrees and his declaring himself "President for Life" gave little hope as to much progress in these two areas. CANNOTANSWER

What was one of the big accomplishments during his presidency?

He renamed the town of Krasnovodsk "Turkmenbashi" after himself, and renamed schools, airports and even a meteorite after himself