Here is the full list of all 44 Never Return achievements.
Freeze 1000 enemies
Open 200 treasure chests
Electrocutes 1000 enemies
Defeat Orc Blademaster
Defeat Bloody Incubus
Get 50,000 soul crystals
Set 1000 enemies on fire
Use of weapon skills 500 times
Kill 500 skeletons
Consumes 50,000 soul crystals
Defeat Bloody Butcher
Defeat Enchanted Dwarf
Defeat Steel Vessel
Deals 100,000 points of blast damage
Deep into the dungeon to reach the 20th floor
Defeat Medusa
Defeat Lord of Frost
Deals 100,000 points of spell damage
Defeat Chaos Orc
Defeat Necrolich
First death in the dungeon
Defeat Deathlord
Use of items 100 times
Restores 100,000 life points
Defeat Ruin Witch
Deals 100,000 points of physical damage
Deals 10,000 damage
100 monsters killed
Kill the first target
Play a two-player game
Died 50 times while deep in the dungeon
Knock out 1000 enemies
Morph 1000 enemies
Deals 100,000 points of piercing damage
Deals 100,000 points of impact damage
Use of healing potions 500 times
Dropping 1000 bombs
Restart the game 50 times
Complete 10 tasks
Kill 50 NPCs
Change the look of your character one time
Sacrifice 100 times
Perfect blocking 100 times
Smash the jar 500 times