Mode: Warzone Firefight.
The Mythic Boss
is exactly like the legendary boss only It has a red triangle instead of a yellow one and comes at the end of the match (Wave 5)
. You will get this achievement as long as you contribute heavily
to the damage against the boss OR get the FINAL
shot. I would suggest using heavy weapons
or heavy vehicles
against the bosses to maximum your damage. Banshees
I found to work great due to their mobility and the damage of the banshee bomb! Good Luck! Note
: The waves change each time you load up the map so unfortunately a mythic boss is not a guarantee for every map BUT has a decent chance of appearing.