Ride a Snowfox.

Disable Alterra communications.

Encounter a sapient alien lifeform.

Construct a spy pengling.

Reach the maximum level with your character.

Kill 100 infected with silver bullets.

Finish every quest.

Successfully complete half of Kovac's challenges while keeping the pylon intact.

Prepare every type of potion.

Prepare a first potion.

Kill 5,000 enemies (of all types).

Equip a pet for the first time.

Upgrade 10 weapons with modules.