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