Be a member of an EASHL club that has recently won a playoff cup and return to the Seasons HUB.
The playoffs occur once every month now, unlike previous games where they occurred every weekend. In order to get this you must either participate on a team that wins the playoffs (4 wins in a row) or you could find a team that won the cup that has an open dressing room and join that team. You don’t even necessarily have to play. If you join the team shortly after they won, the achievement will pop.