The Sacco has obtained high level of achievements over the years besides developing her members and the growth experienced. The UN sacco was among the first 7 to be registered by SASRA as a deposit taking sacco. 

The major milestones of UN SACCO include:

• The Sacco businesses commenced in 1975 under the Chairmanship of Ms. Teresa Muigai. Subsequent Chairpersons are: Mr. John Nyaga, Mr. Alexander Alusa, Ms.Mary Githiomi, Ms.Mary Odhiambo, Mr.Kimani Macharia, Mr.Dennis Kerina Nyamumbo, Mr. Samuel Olago ,Mr.Geoffrey Omedo, Mr.Kimathi Mungania and currently Mr.Bernard Koech.
• The society has grown from 131 members in 1975 to the current over 6,800 members in 2019.
• The society's asset base currently stands at Ksh. 12 Billion with Member deposits at 10.7 Billion and a loan book of Ksh. 8.24 Billion.
• The current UN Sacco offices were built in 2004 and opened its doors to our members on the 7th December 2004 while the Gigiri Square office was opened in 2016.
• The website www.unsacco.unon was launched in 2004 and in 2017 it was reviewed to www.unsacco.org.
• The FOSA (Front Office Service Activities) started operations in 2006.
• In the Cooperative movement in Kenya, the UN Sacco has been recognized as the 6th largest Sacco in terms of Share Capital and Members Deposits; it was among the pioneer 7 Saccos which were the first to be registered by Sacco Societies Regulatory Authority (SASRA) after fulfilling all the required conditions; SASRA is to the Cooperative movement what the Central Bank is to the Banking industry.
• There are 13 loan products,  we encourage members to patronize all the products.
• To enable its member access their funds easily the Sacco has subscribed to Cooperative Bank SACCO-LINK, it is a VISA debit card, therefore members can access their accounts from anywhere in the world wherever there is VISA access
• The UN Sacco has also subscribed to the M-SACCO; this allows members to access funds through the mobile cash transfer anywhere at any time.
• In 2018 UNSACCO launched the mobile based loan called 'Quick Cash Loan'. which allows members to borrow through their mobile phones via the Safaricom network. 

How it is Managed.
The affairs of the UNSACCO are directed by the Board of Directors (BOD). The Supervisory Committee (SC) provides oversight of the society activities. Both the BOD and SC reports to the AGM (Annual General Meeting). The BOD operates through specialized sub committees responsible for various society activities. Both the BOD and Supervisory committee members are elected at the AGM. The day to day operations is carried out by the Sacco staff under the leadership of the Chief Executive Officer (CEO).