vexsa's lab explo achiv bug
Did you defeat Vexa? Open the Magnificent Chest?
the guide say just to go to the midle
I’m not sure which ‘guide’ you speak of.
Here’s what the Wiki says:
Once the golem is defeated, Vexa appears in the center. The solid corners crumble and all platforms are destroyed, leaving you to walk on the brass railings to reach her. In addition, a number of turrets spawn along the railings. Work your way towards Vexa and take out nearby turrets. Vexa herself is of little threat, but occasionally, she’ll do a blast which knocks players back and likely into the water. Once she is defeated, a Magnificent Chest will spawn in the center and players will receive the achievement credit. If you don’t want to use waypoints to exit, there is an exit portal in the shark tank.