In September 2013, producer Mike WiLL Made It revealed that Ciara had begun work on her sixth studio album. In December 2013, Ciara confirmed she was in the process of making a new album. During an interview with Rap-Up magazine Ciara revealed that recording for her sixth album began around Thanksgiving of 2013 and she would be releasing new music "really soon". In late January 2014, Ciara premiered a live version of a song entitled "Anytime" at the Degree Women Grammys Celebration in Los Angeles, on February 2, 2014, Ciara premiered the studio version produced Boi-1da and Katalyst featuring her then-boyfriend and rapper Future. After her engagement to Future, Ciara revealed to W in April 2014 that her sixth studio album would be predominantly inspired by her then-fiance. Ciara gave birth to her first child in May 2014. After claims of Future's infidelity during their relationship had surfaced, it was reported that the couple's engagement had been called off. Following their very public break-up, Ciara's album release was further postponed to 2015, and during this time the singer "quietly" recorded new music, while concentrating on motherhood.  "I Bet", the lead single from her upcoming album Jackie, was released on January 26, 2015. In May 2015, Ciara embarked on her first headlining tour in six years. The month-long Jackie Tour kicked off on May 3, 2015 in Chicago and included stops in New York, Boston, New Orleans, Dallas, and Los Angeles. The first round of US dates wrapped May 31 in San Francisco. Ciara's sixth album, Jackie, was released on May 1, 2015. It includes the singles "I Bet" and "Dance like We're Making Love". The album debuted at number 17 on the Billboard 200 with 25,000 equivalent album units (19,900 in sales) and has the lowest first-week sales amongst her first six albums.  Ciara is currently working on a seventh studio album and has stated that the album will feature her undertaking a new musical direction. On January 27, 2017, it was announced that Ciara had signed a deal with Warner Bros. Records.

Answer this question "what was her biggest accomplishment" by extracting the answer from the text above.
with 25,000 equivalent album units (19,900 in sales)