Unlock 3 characters.

Get first blood.

Play a game session with friends invited through the game session setup.

Get killed by a creep.

Complete Mission 3 (Any Difficulty Level)

Kill 1 000 Zombies

Fully Upgrade All Stats Of Any Weapon In Campaign Mode

Complete Mission 1 (Any Difficulty Level)

Fully Upgrade A Single Stat Of Any Weapon In Campaign Mode

Complete every activity in a single location.

Entered the Infraworld.

Stayed in reality.

Helped Dawkins see the truth.