Alliance achievement

Can anyone explain how to get this achievement? I am really struggling to figure this one out.

Hi @RoGuEKillAZA, thank you for this question and I’m sorry for your struggle. I’ve taken a look at this Achievement and it appears there is currently an issue that can prevent it from being unlocked. We are now tracking this issue internally.

Unfortunately I cannot provide a work-around or alternate solution to unlocking it yet.

Worked fine for me. Pick a map with just one type of native maybe? I completed it on one of my custom maps so not sure if that changes something.