Augustinsson was part of the Sweden under-21 squad that qualified and later won the European U21 Championship in 2015, playing all five games in the main tournament and scoring in the penalty shoot-out against Portugal in the final.

[8] With two senior seasons and 30 league games for Brommapojkarna, Augustinsson moved to IFK Göteborg in January 2013, turning down offers from several other professional clubs.

[12] Augustinsson came back from his second injury in time for the first competitive match in 2014, against Värnamo in Svenska Cupen in early March.

[17] Having played every exhibition game during the winter break for Copenhagen, Augustinsson made his Superliga-debut against Vestsjælland when the season restarted in February.

[citation needed] Augustinsson played regularly in the Danish Cup as well throughout the spring, and scored a match winning 1–0 goal from a free kick against Esbjerg in the second game of the semifinals.

Being rumored with moves to top teams, such as Liverpool,[22] after winning the 2015 UEFA European Under-21 Championship, Augustinsson stayed in Denmark and played his first complete season for Copenhagen.

[24] Ekstra Bladet ranked him as one of the five best players for Copenhagen, awarding 5 of 6 stars for his performance, citing an improvement compared to the spring part of the season.

[25] During the Copenhagen derby at Brøndby on 17 April 2017, Augustinsson had dead rats thrown at him by home supporters as he prepared to take a corner kick.

Play was stopped and Copenhagen players attempted to kick the rats off the pitch before stewards arrived to pick up the rodents.

[31][32] Augustinsson made his debut for Aston Villa on 2 October 2022, an away Premier League draw against Leeds United, starting the match due to an injury to Lucas Digne.

[33] Augustinsson again departed Sevilla on loan in August 2023, joining Belgian Pro League club Anderlecht for the 2023–24 season.

His biggest success came for the under-21 team, when they manage to qualify to the 2015 UEFA European Under-21 Championship and later win the tournament, whilst being a key player in Håkan Ericson's squad.

Showed his commitment and drive (and not to mention fitness) with one final lung-bursting charge into the box in the 121st minute of the game and slammed home his penalty in the shootout.

[38] Augustinsson debuted with the senior team in January 2015, when he started both games in their friendlies against the Ivory Coast[43] and Finland.

Following Hamréns resignation and Janne Andersson's arrival later that summer, Augustinsson got bigger competition when Oscar Wendt re-joined the squad after conflicts with the former head coach.

[47] With Andersson's experimenting of the two veterans at the left-back position in the beginning of the World Cup qualification,[48][49] Augustinsson opened possibilities to join the Sweden under-21 squad, for which he still was eligible to play.

[52] Augustinsson is often referred as a modern wing-back, whose qualities is in his offense, possession, pace and a good left foot.

Critics have stated that players like Augustinsson are successful today because of the amount of money the families invest in private training sessions.

[60] Together with his good friends and former teammates from his time in Brommapojkarna, John Guidetti and Simon Tibbling, Augustinsson does not drink alcohol.