To obtain this achievement you need to win a game using an Support legend. Support legends are denoted with a medical cross logo. Currently, the only two support legends in the game are Lifeline and Loba.
My best advice for winning games would be to find a relatively quiet spot to land with your team and loot up before fighting. Besides that, teamwork is essential. Stick with your squadmates and support them when needed.
Season 9 update: A win in Arena mode also counts for the achievement.