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