On 2 September 2014, Aketxe was promoted to the main squad in La Liga, being assigned number 23 jersey.[5] He appeared in his first match as a professional on 17 September, coming on as a substitute for Iker Muniain in the 75th minute of a 0–0 home draw against FC Shakhtar Donetsk in the group stage of the UEFA Champions League;[6] however, he sustained a foot injury which put him out of action for six weeks.[7]
Aketxe scored his first goal in the Spanish top flight on 17 May 2015, netting his team's first in a 3–2 away win against Elche CF as Athletic came from behind 2–0.[8] In the beginning of 2016, he was moved down back to the B side to help them avoid relegation from Segunda División and gain some minutes.[9] On 27 February he scored a hat-trick in a 4–2 home victory over SD Ponferradina,[10] but they eventually finished in 22nd and last position in spite of his eight goals.[11]
On 31 January 2017, after making no appearances during the first half of the campaign due to recovering from a serious knee injury,[12] Aketxe was loaned to Cádiz CF in the second tier until June.[13] On 16 February 2018, Athletic cancelled his contract with immediate effect (retaining the right to re-sign him in the following years) to allow him to negotiate a move abroad.[14]
On 11 July 2018, Aketxe returned to Cádiz after agreeing to a six-month loan with an option to purchase.[19][20] In November, Toronto and player terminated the remaining term on their contract "by mutual consent".[21]
After cutting ties with the Canadian club, Athletic Bilbao did not exercise their buyback option and Aketxe's original loan with Cádiz became an official deal, expiring on 30 June 2019.[22]
Deportivo
On 13 July 2019, free agent Aketxe joined fellow second division side Deportivo de La Coruña on a one-year deal,[23] where he was given the number 10 shirt. He scored a goal on his official debut on 18 August, in a 3–2 home victory over Real Oviedo.[24]
Almería
On 7 September 2020, after being relegated, Aketxe agreed to a two-year contract with UD Almería in the same league.[25] He again scored in his first appearance, helping to a 2–0 away win against CD Lugo.[26]
On 7 August 2024, Aketxe joined Real Zaragoza on a two-year contract on a free transfer.[30] He scored once again in his league bow, in the 4–0 victory at Cádiz.[31]
Personal life
Aketxe's older brother, Isaac, was also a footballer; he too was groomed at Athletic Bilbao's youth setup.[32] Their father, known as Isaac Aqueche due to spelling conventions of the time, played as a midfielder in the lower divisions of Spanish football[33][34] including a spell with Athletic's reserves.[35]
In May 2016, Aketxe and two others were put on trial for having caused minor injuries to an off-duty ertzaina the previous August during a local festival in his place of residence, the Getxo neighbourhood of Romo.[36]
^Rincón, Jaime (17 May 2015). "Williams señala a Europa" [Williams points to Europe]. Marca (in Spanish). Retrieved 18 May 2015.
^Velasco, Juanma (4 January 2016). "Aketxe se recalifica en el filial" [Aketxe undergoes makeover in reserves]. Marca (in Spanish). Retrieved 6 January 2016.