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