Here is the full list of all 23 Dungeons of Hell achievements.
Complete training
Defeat Baal
Defeat Malphas
Defeat The Devil
Kill 20 Demons
Kill 100 Demons
Kill 20 Witches
Kill 100 Witches
Use 10 Holy Hand Grenades
Use 50 Holy Hand Grenades
Use 10 Stun Grenades
Jump 100 Times
Travel 50 Dungeons
Travel 100 Dungeons
Travel 250 Dungeons
Kill 20 enemies by leaping on them
Kill 80 enemies by leaping on them
Restore 50 Health Points using the Demon Killer skill
Block 20 projectiles with the Shield
Reach Level 12 on any dungeon without taking any damage
Defeat a boss and have exactly 1 health point.
Kill your first demon or witch
Kill an enemy while standing on a demonic invocation