Thanks, in my case it was tricky rift on the right hand side as well!
I had trouble with this mission and then I noticed that a few Ravenās had dropped those little guns onto the battlefield. One or two of them were on the field when I tried finishing it and I failed. When I tried again and cleared all Ravens it worked so be sure to take out all visible Ravens so they donāt spawn (drop) their turrets.
Important to note that using Solar Lance will pause the UI clock, but not the timer used to check for this achievement.
You can see this discrepancy on the load game menu which as the correct time. If cutting it close according to the UI clock didnāt unlock it, thereās a good chance you are actually over the limit.
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Yep, still bugged. Iām not sure what the deal is.