Here is the full list of all 38 Ziggurat achievements.
Win a game with every character (any difficulty)
Get to floor 3 using only the magic wand (Apprentice class only)
Die 50 times
Unlock all perks
Unlock all weapons,perks,lore & character classes
Unlock all magic weapons
Unlock all amulets
Die 25 times
Find a super secret cheat code
Unlock all character classes
Unlock all enemies in the bestiary
Kill all enemies at least once (including bosses)
Kill 5000 enemies
Find all lore scrolls
Die 10 times
Died after killing the boss
Break 2,000 things (Barrels, tombs...)
Kill 500 enemies affected with elemental states
You died on a danger room
Survive the Ziggurat
Kill 1000 enemies
Master a perk by getting it to level 5
Find your first amulet
Complete a challenge room
Find a secret room
You met your match in the final showdown
Reach experience level 15
Reach experience level 10
You've been ambushed in a treasure room
Equip a weapon of every kind
You reached 3rd floor. Now the real lesson begins.
Reach experience level 5
Get your first level up
Win the game without using any level up
Reach floor 2 without getting damaged
Win a game on hard difficulty
Kill a Lost soul with the Skull of Xanatos
Win the game with Argo on Normal difficulty in less than 45 minutes