The church is located in the city center and is surrounded by a cemetery.
A first consecration of a church is one of the first documented mention of Schladming was the place in 1299 branch parish vicariate (Catholic) of the neighboring parish in Haus. In the 16th century, unlike in Haus, Schladming saw a split in faith. An independent Catholic parish was not established in Schladming until 1857.
The city parish church is late Gothic in its core and received its present-day appearance as a three-aisled, five-aisled hall church through extensive renovations between 1522 and 1532. The tower has been wearing an onion helmet since 1832, which was restored to its original state after a fire in 1937.
The high altar was designed by Peter Hafner from Radstadt and Martin Neuberg from Admont from 1702 to 1704. The central image of the high altar shows St. Achatius and is surrounded by figures of the apostles Peter and Paul and the evangelist John and John the Baptist.
The side altar on the left shows St. Luke and the Coronation of Mary, the side altar on the right is a rosary altar.
Various other figures are erected in the church, including: a. a figure of St. Sebastian on one of the pillars and a Madonna figure. The fields of the parapet balustrade are painted with saints.