He Never Gets Me Anything
From Halopedia, the Halo wiki
He Never Gets Me Anything is an achievement in Halo: The Master Chief Collection. It is unlocked by completing Delta Halo on Heroic or Legendary without entering any vehicle. The achievement is worth 10 gamerpoints.
Tips
The achievement is made easy by utilizing the Scarab skull, which turns every gun the player uses into a Scarab Gun, and the Bandanna skull, which grants the player unlimited ammo. Players who find this method so easy as to be unsporting may choose to use the Bandanna skull alone and utilize unlimited rockets and sniper rounds.
Trivia
The name of the achievement is a reference to a quote from the beginning of Metropolis, as Cortana thanks Sergeant Johnson for delivery of a Scorpion tank. The player similarly has a Scorpion delivered on Regret, though to unlock the achievement, they must leave it behind.