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