Fantastic Beasts: The Crimes of Grindelwald - Assassin’s Creed
Turner started his career in 2010, modeling for companies such as Next and Reebok, and in his first acting role for the short student, film Think of England for the University of Hertfordshire Film and Television programme.
He starred as Tony in Zero, a 2011 film directed by David Barrouk and produced by Michael Riley. He then starred alongside Waterloo Road star Ben-Ryan Davies in 2012 Short film Human Beings, Directed by Jonathan Entwistle.
In 2012, he appears in the French group The Shoes' video clip Time to Dance, with Jake Gyllenhaal.
Later in 2012, Turner was cast in ITV series Leaving, alongside actress Helen McCrory. "Leaving will focus on the relationship between disillusioned 25-year-old Aaron (Turner) and unhappy 45-year-old wife and mother Julie (McCrory). When the pair begin working together at a Cheshire country house hotel, they share an intimate moment which takes them both by surprise and must face the consequences of their actions." – ITV. Turner's performance was met with mostly positive reviews.
In December 2012, Turner starred opposite actors Andrew Scott and Martin Clunes in another ITV Drama, The Town. Portraying Ashley, a troubled teen and reckless boy racer, who is much more complicated than he first appears.
In early 2013, Turner made a guest appearance in Showtime's historical-fiction drama television series, The Borgias as Calvino. He also starred in short film Alleycats as Eze, Directed by Ian Bonhôte. He also had a small role as Phillip in the second series of BBC One's Ripper Street.
In June 2012, Turner was cast for the lead role of a John Boorman film Queen and Country. Turner stated that Boorman revealed secrets and very personal events from his life, in order for Turner to portray him as best as he could.
In early 2014, Turner joined the cast of Paul McGuigan's horror film Victor Frankenstein.
In April 2014, it was announced Turner had joined the cast of E4's whodunit series Glue. Turner plays Eli, a gypsy traveler, whose younger brother Cal (Tommy Knight) is murdered.
He starred as Danny in the film Tramps, which premiered at the 2016 Toronto International Film Festival.
In 2016 he also stared in War & Peace as Anatole Kragin.
Turner played Nathan in Assassin’s Creed in 2016, as well.
In 2018 Turner played Theseus Scamander in the Popular Harry Potter film, Fantastic Beasts: The Crimes of Grindelwald.