Treasure Collector
Win 50 matches of Plunder

Overseer
Get the Curator Medal while on Crushing Difficulty

Unstoppable
Get the Unyielding Medal while on Crushing Difficulty

Immortal
Complete a Co-op Arena Map on Hard Difficulty without losing a single life

Not Afraid of the Dark
Get 50 Lights Out Medals

Spartan
Get 150 In The Shade Medals

Firefighter
Get 150 Shade Survivalist Medals

Capital Punishment
Get 25 Executioner Medals

Head Crusher
Get 50 Head Hunter Medals

Hold the Line
Get 50 None Shall Pass Medals