Here is the full list of all 21 Envy the Dead achievements.
Complete game
Complete stage 2
Kill stinker boss
Train character to level 4
Feed dying hungry character
Explode barrel or propane
Complete stage 1
Defeat survivors in battle
Defeat zombies in battle
Equip character with any armor
Kill butcher boss
Heal dying injured character
Use conviction answer
Gather any supply on x8 rate
Craft turret
Complete stage 1 on hardcore
Complete stage 2 on hardcore
Complete game on hardcore
Survive wave 10 in survival
Survive wave 20 in survival
Survive wave 30 in survival