Here is the full list of all 30 Slain: Back from Hell achievements.
Kill every Beholder in the Hive without using mana.
Die for the very first time.
Successfully avoid the first spike trap in the Bloodgrounds.
You Have Been Killed 100 times. Rejoice!
Finish the Bloodgrounds without dying at all.
Defeat the Thorn Beast without losing any health.
Reached the top of the Blood Tower without falling in any gore pits.
Defeat the Fire Hounds without losing any health.
Escape the Highlands Caves through the secret passage.
Complete Highlands level without killing an enemy with the flame blade.
Defeat the Banshee Queen without losing any health.
Squash a Wolf Guard in a crusher trap.
Complete the Wolf Run without losing any health.
Defeat Lupus Rex without losing any health.
Defeat the Mother Beholder without losing any health.
Dispatch the Mother Beholder within 30 seconds.
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.
Slay 8 of your enemies in a trice.
Successfully execute 100 Critical Strikes.
Destroy 30 enemies with reflected projectiles.
Watch 30 enemies get killed by traps.
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.