Walk-Off Winner is an achievement in Halo Wars that is unlocked when the player uses one of the six Major Leader Powers to destroy an enemy's last unit. It is worth thirty Gamerpoints[1].
Some easy ways 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. Alternatively, you can go on release and release the Flood, and then use a leader power to destroy them all. You could play a 1 vs1 with a friend and get him to buy no units, then use a leader power on his scout unit.
The name is a reference to a "Walk Off" in baseball, in which a hit by a batter scores a run in the bottom of the ninth inning or later, and in doing so adds enough runs to their score to win the game. As a result, the batter simply "walks off" the field once the winning run is scored.
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