If you don't have someone to boost with, then an easy way to get this achievement:
Match Settings:
Players: 3v3
Map: Any 3v3 map
Game Type: Deathmatch
Difficulty: Easy
Choose any Human(for Warthog Rush)
AI's: make them all human, Covenant bases are annoyingly stronger.
When the match starts, queue up max Warthog's, turn on the Pain Train skull and any other helpful Skulls if you have them, and go straight to the closest enemy base with your Warthog. Try to take out enemy Warthogs if you see them. Keep pressing
or set global rally points with a doubleclick of the
to get your Warthogs into the action fast. The Warthogs will clear the map very fast! Target Turrets also as they can wreck Warthogs, and don't forget to build more Warthogs if you lose some.