Here is the full list of all 38 Ziggurat achievements.
Master a perk by getting it to level 5
You met your match in the final showdown
Kill 500 enemies affected with elemental states
Kill 5000 enemies
Unlock all perks
Unlock all magic weapons
Died after killing the boss
Complete a challenge room
Unlock all amulets
Find all lore scrolls
Reach experience level 10
You reached 3rd floor. Now the real lesson begins.
Equip a weapon of every kind
Break 2,000 things (Barrels, tombs...)
Die 50 times
Kill a Lost soul with the Skull of Xanatos
Reach experience level 5
Kill 1000 enemies
Die 25 times
Find a secret room
Die 10 times
Find your first amulet
You died on a danger room
Get your first level up
You've been ambushed in a treasure room
Find a super secret cheat code
Survive the Ziggurat
Unlock all character classes
Unlock all weapons,perks,lore & character classes
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
Reach experience level 15
Win a game with every character (any difficulty)
Win a game on hard difficulty
Unlock all enemies in the bestiary
Win the game with Argo on Normal difficulty in less than 45 minutes