|Upgrade 3 Towers in any single Battlegrounds match|
Once your Guardian reaches level 6, walk up to one of your ally towers while in a game and press + simultaneously to open up the Tower upgrade screen. The only option that will be available to you at that time will be the right one. Do this to three different towers, or level up and keep upgrading the same tower at level 9 and 12, all in one game, to get the achievement.
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