Hi , since the achievement can not be attained in regular Custom ---> Arena here is what I did and how I set my custom game:
Game Mode - Hunt
Difficulty - Favors Hunters
Round Lenght - 5:00
Reinforcement time - 0:15
Strikes - Infinite
Just make sure that you do
NOT use the
PS : Also make sure not to change classes with the D-pad
the bots might already used their ability and that might void your cheevo :)
Happy hunting