Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A New Challenger Has Appeared	Complete your first Challenge.
Acerbic Personality	Rosa Reznick agreed to help stop that fool, Kammler.
Al-Bhutan Oil Depot	Beat the Al-Bhutan Oil Depot level.
Apage Satanas	Kill your first Demon.
Bear with Me	Wojtek Galica and his beast joined the Enigma Squad.
Can Opener	Kill your first Panzerwolf.
Challenge Accepted	Complete 10 Challenges.
Daddy Issues	Alistair Sterling decided to join the action in person.
Enigma Squad Certified	Fully upgrade All Skills.
Face Your Inner Demons	Siegfried von Adelsberg received a (somewhat lukewarm) welcome back to Enigma Squad.
Field Marshal	Beat all missions on Hard difficulty.
General	Beat all missions on Medium difficulty or higher.
Ghost Buster	Kill your first Geist.
Gis-Eren	Beat the Gis-Eren level.
Gorge of Eternal Peril	Launch an enemy into a chasm.
Hardly a Challenge	Complete 30 Challenges.
Hey, Sis!	Isabella Sterling reluctantly joined forces with her brother.
I Want My Scalps	Kill 100 enemies.
Kammler's Secret Base	Beat Kammler's Secret Base level.
Kammler's Underground Complex	Beat Kammler's Underground Complex level.
Kill All Nazis	Kill 1000 enemies.
Lieutenant	Beat all missions on any difficulty level.
Lilleby	Beat the Lilleby level.
Löwenfels Castle	Beat the Löwenfels Castle level.
Madinat Aldaala	Beat the Madinat Aldaala level.
Nothing to See Here	End an alarm by killing every enemy in the area.
Prototype Testing Site	Beat the Prototype Testing Site level.
Site of Sacrifice	Beat the Site of Sacrifice level.
Stamp 'em Out	Kill 500 enemies.
That's not up to Code	Kill at least five enemies with a single environmental kill.
Where Is Your God Now?	Hans Kammler has been defeated - for good.
You Dare Challenge Me?	Complete all Challenges.