Kill all enemies while escaping from the collapsed building

Feed a flytrap with a Nom parasite

Rescue the princess

Perform 25% of the Single Player Skillshots

Complete Mission 6

Complete Dead Ahead on any difficulty.

Kill a Suicider with his own explosives.

Collect more than 100,000 Source

Complete Mission 5

Kill 20 enemies with headshots in a single battle

Fell 99 feet and caught yourself in the monkey suit in GPU Jungle.

Complete Mission 4