Here is the full list of all 17 The Devil Within: Satgat Demo achievements.
Begin your journey at the Ebon Sting.
Head covered now head forth!
Begin your journey at the Ruined City.
Defeat the enemies and meet the cowardly survivor.
Find a way to restore power to the elevator.
Obtain the sword, 'Cheonggang.'
Take down the leader of the Wetas.
Obtain the gun, 'Wanderer.'
Obtain the 'Ritual Bell' artifact.
Use 'Soul Destruction' through the power of the 'Ritual Bell' artifact.
Defeat the waves of enemies to get out of the area.
Bear witness to the giant worms rampaging underground.
Avoid the giant worms and get to safety.
Clear all stage 1 sections and reach the boss.
Find Lee Choong, leader of the Black Crows.
Unleash the power of the devil upon Lee Choong.
Clear all sections of the demo and return to the title screen.