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It depends whether the answer is from a Shia view or Sunni view. From Shia view, he had no achievements because he was not qualified for the position of Caliphate and, in fact, stole this position from Imam Ali a.s. and so he destroyed Islam and made Bidats (for example making Taraweeh prayer by Jamaat and banning the Mutah ,...)
What else can I help you with?
When did Yahya ibn Idris ibn Umar die?
Yahya ibn Idris ibn Umar died in 917.
When did Sayf ibn Umar die?
Sayf ibn Umar died in 796.
When did Ali ibn Umar die?
Ali ibn Umar died in 883.
When did Umar ibn Hafsun die?
Umar ibn Hafsun died in 918.
When was Umar ibn Hafsun born?
Umar ibn Hafsun was born in 850.
When did Yahya ibn Umar die?
Yahya ibn Umar died in 864.
When did Al-Qadi Aqib ibn Mahmud ibn Umar die?
Al-Qadi Aqib ibn Mahmud ibn Umar died in 1627.
When was Al-Qadi Aqib ibn Mahmud ibn Umar born?
Al-Qadi Aqib ibn Mahmud ibn Umar was born in 1556.
When did Umar Ibn Muhammad of Borno die?
Umar Ibn Muhammad of Borno died in 1967.
When did Abû 'Umar ibn Sa'îd die?
Abû 'Umar ibn Sa'îd died in 1287.
When was Umar Ibn Abi Rabi'ah born?
Umar Ibn Abi Rabi'ah was born in 644.
When did Yahya ibn Umar al-Lamtuni die?
Yahya ibn Umar al-Lamtuni died in 1056.
