Complete act 4.

Customize 25 weapons.

Use a large medkit to heal an injury of 5% or less.

Defeat 500 Drow

Complete the quest: Temple of the Primordial

Kill a Butcher using an axe.

Complete 10 normal dungeons

Play with 10 different co-op partners for at least 15 minutes each.

Complete the quest: The Edge of the Underdark

Defeat 500 Aberrations

Kill 50 human enemies.

Kill 250 zombies with modified weapons.

Kill 5 Infected in a row with a single blow.