Achievement can’t be gotten for seems like the whole community. Leviathan made a post claiming this was fixed in a patch in early something May of 2020, but clearly wasn’t as everyone I talk to has this issue and I can’t find anyone with a solution. The achievement can’t be achieved in either ranked or unranked play, the bar doesn’t go up no matter how much you recharge shields. Thank you
The achievement is not bugged. Inflicting friendly fire on a unit and healing it does not count, custom games do not count.
Actually recharging 3000 shields in a ranked 1v1 game will give you the achievement.