  Extriangulated categories were introduced by Nakaoka and Palu by extracting
the similarities between exact categories and triangulated categories. In this
article, we introduce and study the notion of $\xi$-tilting object in an
extriangulated category, where $\xi$ is a proper class of
$\mathbb{E}$-triangles. This extends results in \cite{YGH_2020}.
