Here is the full list of all 44 Apocalypse Party achievements.
Unlock all characters
Unlock the encrypted code
Unlock all Sacred Ability Archives
Unlock all Talent Archives
Defeat the boss Horseman of War·Furnace 3 times
Defeat the boss Dwarf King·Evil Eye 3 times
Defeat the boss Deer-headed Elf·Raging Wind 3 times
Have a child
Clear 【Chapter 3: Nightmare】
Clear 【Chapter 2: Heroes】
Defeat the boss Horseman of Famine·Huhu & Lulu & Dodo 3 times
Defeat the boss Death Knight·Headless 3 times
Clear 【Chapter 1: The Messiah】
Defeat the boss Horseman of Plague·Loving Father 3 times
Defeat the boss Sixth Seal·Eclipse & New Moon 3 times
Defeat the boss Ancient Titan·Tiny 3 times
Clear 【Prologue: The Trial】
Complete a multiplayer game
Play one game
Unlock all Weapon Archives
Defeat Satan in the Prologue
Win the game as a zombie
Have the talent 【Mighty Loner】 and clear the game
Own 6 dragons simultaneously
Hold 4 firearms simultaneously
Unlock all character skills
Complete Male Plus Male