Repeat Survivor is a Halo 4 achievement added with the Champions Bundle. It is awarded when the player, in Bullseye DLC matchmaking, survives three vehicle explosions in a row with the Survivor support package.
Utilizing the Survivor support upgrade does not automatically mean the player will survive destruction of their vehicle. If the player's shields are sufficiently damaged, they will still be killed when their vehicle explodes. In order to unlock the achievement, the player must allow their vehicle to become damaged, retreat and allow their shields to recharge, then return to combat and have their vehicle destroyed. This is best accomplished in the Ghost, which is fast and light, but unlike the Mongoose, provides protection to its driver.