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 20 times
Killed two Seraphs in one attack
Killed a Judge's Aspect with Terminus
Killed 25 enemies while maintaining a Hit Streak
Never hit off-beat in a Hell
Destroyed the Red Judge
Soared (Dash + jump) 100 times
Completed all Torments
Destroyed the Red Judge aspect in Acheron
Destroyed the Red Judge aspect in Nihil
Destroyed the Red Judge aspect in Gehenna
Destroyed the Red Judge aspect in Incaustis
Obtained all weapons
Cleared a Hell using only Paz
Reached Hit Streak: 50
Destroyed the Red Judge aspect in Yhelm
Killed 8 enemies in 4 seconds
Got 666 kills (game total)
Killed 50 Behemoths
Died in a Chaos Crystal explosion
Destroyed the Red Judge aspect in Stygia
Reached Hit Streak: 35
Completed a Torment
Achieved the top result in a Torment
Destroyed the Red Judge aspect in Voke
Multi-killed 2 enemies
Reached Hit Streak: 20
Reached Hit Streak: 10