Sumerian Six Steam Key

Löwenfels Castle

Beat the Löwenfels Castle level

Lilleby

Beat the Lilleby level

Madinat Aldaala

Beat the Madinat Aldaala level

Al-Bhutan Oil Depot

Beat the Al-Bhutan Oil Depot level

Prototype Testing Site

Beat the Prototype Testing Site level

Gis-Eren

Beat the Gis-Eren level

Kammler's Secret Base

Beat Kammler's Secret Base level

Kammler's Underground Complex

Beat Kammler's Underground Complex level

Site of Sacrifice

Beat the Site of Sacrifice level

Lieutenant

Beat all missions on any difficulty level

General

Beat all missions on Medium difficulty or higher

Field Marshal

Beat all missions on Hard difficulty

Hey, Sis!

Isabella Sterling reluctantly joined forces with her brother

Acerbic Personality

Rosa Reznick agreed to help stop that fool, Kammler

Bear with Me

Wojtek Galica and his beast joined the Enigma Squad

Daddy Issues

Alistair Sterling decided to join the action in person

Face Your Inner Demons

Siegfried von Adelsberg received a (somewhat lukewarm) welcome back to Enigma Squad

Where Is Your God Now?

A New Challenger Has Appeared

Complete your first Challenge

Challenge Accepted

Complete 10 Challenges

Hardly a Challenge

Complete 30 Challenges

You Dare Challenge Me?

Complete all Challenges

I Want My Scalps

Kill 100 enemies

Stamp 'em Out

Kill 500 enemies

Kill All Nazis

Kill 1000 enemies

Can Opener

Kill your first Panzerwolf

Ghost Buster

Kill your first Geist

Apage Satanas

Kill your first Demon

That's not up to Code

Kill at least 5 enemies with a single environmental kill

Gorge of Eternal Peril

Launch an enemy into a chasm

Nothing to See Here

End an alarm by killing every enemy in the area

Enigma Squad Certified

Fully upgrade All Skills