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