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