This achievement sounds harder than it is.
These are more tips/informations instead of an achievement guide:
1. You can take damage but you`re not allowed to lose your whole life (Big Red Heart).
2. You are not allowed to use a healing potion BUT you can eat fruits like apples to restore your life.
3. If you have trouble to get through the level without dying, just play on normal mode and set your class level completely down.
Edit 08.01.2021: @kanedaa
You can use the new Death Barter enchantment and still earn this.