You've acquired S Rank in "The Bell-Stealing Drill".

Kill 500 zombies

Multi-Kill 3 car soldiers at once using an explosive weapon in Campaign or Escalation.

Decepticon Campaign Complete (Medium).

Complete Death of Hope on any difficulty.

Complete Fuel of War on any difficulty.

Get 10 kills using detached turrets in any mode.

Create a fighter in Create A Fighter

Cover Kratos in 500 buckets of blood by killing the enemies

Kill Hades

Discover the secret 'Hades Arm' room

Rip apart 1 Olympus Sentry