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