Here is the full list of all 30 Slain: Back from Hell achievements.
Defeat the Mother Beholder without losing any health.
Dispatch the Mother Beholder within 30 seconds.
Slay 8 of your enemies in a trice.
Defeat the Fire Hounds without losing any health.
Reached the top of the Blood Tower without falling in any gore pits.
Destroy 30 enemies with reflected projectiles.
Defeat Lupus Rex without losing any health.
Complete the Wolf Run without losing any health.
Finish the Bloodgrounds without dying at all.
Defeat the Thorn Beast without losing any health.
Kill every Beholder in the Hive without using mana.
Defeat the Banshee Queen without losing any health.
Watch 30 enemies get killed by traps.
Escape the Highlands Caves through the secret passage.
Successfully execute 100 Critical Strikes.
Squash a Wolf Guard in a crusher trap.
You Have Been Killed 100 times. Rejoice!
Successfully avoid the first spike trap in the Bloodgrounds.
Die for the very first time.
Complete Highlands level without killing an enemy with the flame blade.
Hit 6 Ice Meteors back at the Ice Beast.
Defeat the Ice Beast without losing any health.
Defeat Malikesh without losing any health.
Defeat Hogre without losing any health.
Headbang after every single boss has been defeated.
Find all five pieces of the Talisman.
Kill Vroll without taking any damage.
Destroy Vroll and liberate Chalh within 3 minutes.
Defeat the game without using any Mana.
Defeat the game without losing a single life.