Mortardom

Mortardom is an achievement in Halo 4. It is awarded in the fifth campaign level, Reclaimer, for boarding a Wraith and using it to destroy four enemy Wraiths on Heroic or harder. The achievement is worth 20 Gamerscore. It is represented by a Wraith on four five-pointed stars.

Trivia
The achievement name is a play on the words "mortar" and "Martyrdom".