Here is the full list of all 20 Not Dying Today achievements.
Complete Game In Hard Mode
Complete Game In Hell Mode
Burn 100 zombies to the ground
Unlock All Melee Weapons
Unlock All Gun Weapons
Complete Game In Easy Mode
Complete Game In Normal Mode
Defeat Z-Load
Kill Boss Spider
Collect 100000 gold in the game
Kill Boss Warden
Enhance a remote weapon to max grade
Kill Boss Tanker
Enhance a melee weapon to max grade
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