A deep breath

Kill 1000 Enemies

Finish A Level with 100% On Any Difficulty

Kill 20 Enemies With Environmental Hazards

Find All The Secrets In A Level

Kill 100 Enemies

Kill an enemy with CQC from prone camo.

Kill an enemy shortly after another player in Coop has killed one.

Complete game on I AM DEATH INCARNATE! (or ÜBER)

Unlock demolition perk 5

Solve the fourth Enigma code

Complete game on any difficulty