Icebreaker

Lynx is not available until the 2nd half of V1.3. You can use a support Lynx for this achievement.

The term "icebreaker" has multiple meanings, depending on the context in which it is used. Originally, an icebreaker is a type of ship designed to move through ice-covered waters. In a social context, an icebreaker refers to an activity, game, or question designed to help people get to know each other. In the context of Star Rail, icebreaker is used in a literal sense, with Lynx using an ice axe or an ice-breaking axe as her weapon.