Here is the full list of all 14 Zavix Tower achievements.
Defeat Magranus on floor 50.
Defeat Ryaaksus on floor 45.
Defeat Ryaavaku on floor 40.
Defeat Vulcanus on floor 35.
Defeat Baron Noddeg on floor 30.
Defeat Ceethose on floor 25.
Defeat the orc brothers on floor 20.
Defeat Klopo on floor 15
Loot 10 Epic items.
Defeat Pylemris on floor 10.
Beat Redrum on floor 5.
Loot one Epic item.
Loot 25 Epic items.
Loot 100 Epic items.