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