Here is the full list of all 20 Not Dying Today achievements.
Complete Game In Hard Mode
Complete Game In Hell Mode
Complete Game In Normal Mode
Burn 100 zombies to the ground
Unlock All Melee Weapons
Unlock All Gun Weapons
Complete Game In Easy Mode
Defeat Z-Load
Collect 100000 gold in the game
Enhance a remote weapon to max grade
Enhance a melee weapon to max grade
Kill Boss Spider
Kill Boss Warden
Use one grenade to kill more than 10 zombies
Kill Boss Tanker
Kill Boss Dr.Brain
Kill Boss Nurse
Transform into Zombie
Kill Boss Butcher
Clear Mission 0