Here is the full list of all 28 Metal: Hellsinger achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Died in a Chaos Crystal explosion
Destroyed the Red Judge aspect in Acheron
Killed 50 Behemoths
Destroyed the Red Judge aspect in Nihil
Destroyed the Red Judge aspect in Gehenna
Destroyed the Red Judge aspect in Incaustis
Obtained all weapons
Destroyed the Red Judge aspect in Yhelm
Destroyed the Red Judge aspect in Stygia
Reached Hit Streak: 35
Got 666 kills (game total)
Killed 8 enemies in 4 seconds
Completed a Torment
Destroyed the Red Judge aspect in Voke
Reached Hit Streak: 20
Multi-killed 2 enemies
Reached Hit Streak: 10
Destroyed the Red Judge
Reached Hit Streak: 50
Achieved the top result in a Torment
Completed all Torments
Soared (Dash + jump) 100 times
Never hit off-beat in a Hell
Died 20 times
Killed 25 enemies while maintaining a Hit Streak
Killed two Seraphs in one attack
Cleared a Hell using only Paz
Killed a Judge's Aspect with Terminus