Walk-Off Winner
From Halopedia, the Halo wiki
Walk-Off Winner
Walk-Off Winner is an achievement in Halo Wars that is unlocked when you use one of the 6 Major Leader Powers to destroy an enemy's last unit [1].
An easy way to do this is go on the advanced tutorial, then when you are in control of Regret move the Locusts away and then kill all of the enemy units outside of the UNSC base.
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