Here is the full list of all 38 Deathstate achievements.
Die 100 times.
Beat the game without picking up a weapon item.
Play the game for a combined total of 24 hours.
Beat the game without picking up a grimoire item.
Find at least 140 unique items.
Beat the game as the Embalmer.
Find and equip 5 different grimoires in a single game as the Seeker.
Beat the game twice sequentially.
Die at Depth 1 as the Embalmer.
Punch the final boss as the Brawler.
Unlock all bestiary entries.
Kill a boss while under the effects of an Introspection potion.
Enter the Dark Realm.
Teleport 20 times in one game as the Starcreep.
Collect three eye organs as the Eye.
Kill a boss while under the effects of a Hot Blood potion.
Have 20 or more organs at one time.
Drink 10 potions as the Scientist.
Kill an Elite enemy after time runs out in a level.
Turn into a Demon as the Priest.
Beat a level without taking damage.
Die in the first minute of gameplay.
Beat the game.
Find 500 gold in one run.
Enter the Lost Arcanium.
Enter the Maze of Ix.
Start and end a boss fight with only one hit remaining.
Escape a level after time has run out.
Find a Demon or Horror aspect stone.
Enter the Ossein Swamp.
Gamble with the Merchant as Scar.
Resurrect 30 or more enemies with a single Awaken potion.
Enter the Fortress of Koth.
Unlock all playable characters.
Beat the game as the Skeleton King.
Beat the game at maximum Desecration.
Beat the game without taking damage.
Unlock all other achievements.