Here is the full list of all 14 Hellblusser achievements.
Enter hell.
Obtain 10 blessings.
Obtain the cloak of sadness, drain blade, and become a drainer.
Eat a donut while being hungry.
Complete a level with full health.
Obtain 5 blessings.
Collect 50 coins.
Enter the dungeon.
Complete a level with full fire.
Obtain 20 blessings.
Collect 50 tears.
Obtain the golden blade.
Loop back to the sewer.
Extinguish the hell with no blessings obtained.