4回半ひねり

Easiest to achieve in Silvermane Restricted Guard Zone Difficulty 1, Winter Soldier's March. 5 relatively weak enemies on that stage. Alternatively you can try this in Forgotten Hall 1.

This achievement has no cultural references in the English and Chinese versions. It is specific to the game, with pirouette being a ballet term that describes a complete turn or spin on one leg, while "four-and-a-half" refers to Herta spinning four and a half times.