During his six-and-a-half-year tenure, Alguacil guided the team to several notable victories, including the Copa del Rey title in 2021. In the final against Athletic Club, Real Sociedad won 1-0, with Mikel Oyarzabal scoring the winning penalty. This historic win ended a 34-year trophy drought for the club.

Another notable highlight of Alguacil's time at Real Sociedad was the team's 4-3 victory over Real Madrid at the Santiago Bernabéu in the 2020 Copa del Rey. This thrilling match showcased the team's fearlessness and skill.

Under Alguacil's leadership, Real Sociedad consistently qualified for European competitions, securing a spot in the Champions League for the first time in over 20 years in the 2022-23 season. The team topped their group and reached the last 16.

One of Alguacil's key strengths was his ability to develop young players from the club's youth academy, Zubieta. He gave opportunities to players like Igor Zubeldia, Martín Zubimendi, and Ander Barrenetxea, who have all flourished under his guidance.

Alguacil's playing style, which emphasized possession-based football and collective effort, earned praise from fans and opponents alike. His team's performances were characterized by their elegance and skill.

Real Sociedad dominated their local rivals, Athletic Club, during Alguacil's tenure, winning seven matches, drawing two, and losing five. This includes the historic Copa del Rey final victory that brought the trophy to the city of Donostia.

Alguacil also broke John Toshack's record for most away wins as Real Sociedad manager, currently standing at 64 victories on the road.

Alguacil's emotional connection with the fans was undeniable. His post-Copa del Rey celebrations, including a heartfelt press conference, captured the hearts of supporters worldwide.

These achievements and moments showcase Alguacil's lasting impact on Real Sociedad's history and identity. His legacy will continue to be felt in San Sebastián long after his departure.