Born in Merendree,[1] Van Acker joined the academy at Club Brugge at the age of four.[2] On 3 November 2009, he signed his first professional contract for the club on 3 November 2009, lasting until the summer of 2012.[3] He made his debut for Club Brugge on 26 December 2010 in a 2–0 victory away at K.A.A. Gent, before going on to make a further 7 league appearances that season.[1]
Over the next few seasons, Van Acker played a rotational role in Club Brugge's squad,[4] and he would sign a two-year contract extension in 2011, keeping at the club until June 2014.[5] He joined Beerschot on loan in January 2013,[4] and made 11 league appearances for the club before returning to Club Brugge at the end of the season.[1]
In June 2013, Van Acker signed for fellow Brugge-based club Cercle Brugge on a three-year contract.[6] He made his league debut for the club on 27 July 2013 in a 1–1 draw at R.A.E.C. Mons, their first game of the season, before scoring the first goal of his professional career on 5 October 2013 in a 2–1 win at K.V. Mechelen.[1] Over three years at the club, he made 89 league appearances, scoring 5.[1]
Following the expiry of his contract in June 2016, Van Acker joined K.S.V. Roeselare on a two-year contract.[7] He made his debut for the club on 5 August 2016 in a 2–2 draw at home to Lierse S.K., before going on to make 23 league appearances during the 2016–17 season, scoring once.[1] After making 31 league appearances and scoring 3 goals during the 2017–18 season, his contract was extended by a further year.[8] During the 2018–19 season, he made 25 league appearances dor Roeselare, in which he scored 4 goals.[1]
In September 2019, Van Acker joined Eerste Divisie club MVV Maastricht on a one-year contract.[9] Van Acker made his debut for MVV Maastricht on 13 September 2019 in a 2–1 defeat at home to SC Telstar,[10] before going on to make 24 appearances for the club during the season, though he did not score.[1] In June 2020, Van Acker signed a one-year contract extension.[11]