Level: The Maw - Now for the level-specific achievement. In the harrowing ride through explosions and flood, you must keep your Warthog upright. As with so many others, this one will be easier for you on a lower difficulty and isn’t tied to Legendary, so take that into account before making too many attempts at it on Legendary. The biggest hurdles here are making sure you don’t catch the lip of a ramp wrong and flip your hog, and to avoid getting too close to the exploding flood enemies.