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