Stygian: Reign of the Old Ones achievements

Kill 10 extra-terrestrial entities.

Complete the game with Rational Belief System

Invest 10 points in the Subterfuge Skill

Suffer 30 Critical Failures

Kill 25 Mob men

Attain hostile status against all factions (Mob and Cult)

Deal 30 Critical Attacks

Invest 10 points in the Psychology Skill

Invest 10 points in the Stealth Skill

Finish the game without having none of your companions nor henchmen killed and make the ultimate sacrifice.

Invest 10 points in the Science Skill

Talk with 5 spirits