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