Kill 7 chickens in under 10 seconds in 'The Hornet's Nest'.

Campaign: finish Heavy Metal

Campaign: destroy 1000 objects

Campaign: demolish 1 house

Campaign: finish Upriver

Campaign: 50 kills with sniper rifles

Campaign: destroy 1 satellite uplink

Campaign: find 5 collectable weapons

Campaign: 50 kills with assault rifles

Campaign: finish Operation Aurora

Earn 5 Silver Bullet Ribbons, the Longshot Ribbon and the Sniper Master Specialist Medal.

Awarded when a player unlocks all skills in a skill tree.