Here is the full list of all 38 Ziggurat achievements.
Died after killing the boss
Unlock all character classes
Die 25 times
Find all lore scrolls
Kill 5000 enemies
Kill a Lost soul with the Skull of Xanatos
Break 2,000 things (Barrels, tombs...)
Survive the Ziggurat
Kill 500 enemies affected with elemental states
Die 10 times
You met your match in the final showdown
Reach experience level 15
You died on a danger room
Kill 1000 enemies
Master a perk by getting it to level 5
Reach experience level 10
You've been ambushed in a treasure room
Find a secret room
Find your first amulet
You reached 3rd floor. Now the real lesson begins.
Reach experience level 5
Equip a weapon of every kind
Complete a challenge room
Get your first level up
Find a super secret cheat code
Unlock all magic weapons
Unlock all perks
Unlock all weapons,perks,lore & character classes
Die 50 times
Get to floor 3 using only the magic wand (Apprentice class only)
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