Six Pedals, Four Directions
Six Pedals, Four Directions is an achievement in Halo: The Master Chief Collection. It is unlocked by driving a Scorpion tank whilst playing as the Arbiter. The achievement is worth 10 gamerpoints and can be unlocked on any difficulty.
There are two additional tanks earlier in the level: one in the first large room with the pair of Enforcers; another just before the entrance to the crashed Sentinel manufacturing facility. However, the first Scorpion is often, and the second is always occupied by Flood, and must be hijacked before they can be used.
The name of the achievement is taken from a line in the Red vs. Blue first season episode "Check out the Treads on That Tank", in which a frustrated Caboose asks, "Why are there six pedals if there are only four directions?" Six Pedals has since become a running gag on the show.