What are your Fun MD Achievement Ideas

Here are some of mine:

Corrode 100 times throughout the dungeon

30 sinners die throughout the dungeon

Have a cumulative total of 10000 gold at a shop

Have more than 20 debuffs on a single enemy

Have every single sin and damage type rock ego gift

Win a fight while only using defensive skills

Deal >10000 damage using a single skill

Complete up to floor 10 without using a single ego

And the hardest challenge of all:

Complete MD5H without using Winrate or damage