The Multiclass Update Title update for Ring of Pain has 16 achievements.
Complete a run without killing a Scrounger
Complete a run with your Stealth, Crit and Dodge chance lower than 10%
Complete a run without taking any explode damage
Complete a run without gaining any stats from Stat Boosts
Complete a run with only Diviner items equipped
Complete a run with only Soul Kin items equipped
Complete a run with only Multiclass items equipped
Complete a run with only Stalker items equipped
Complete a run with only Brute items equipped
Kill all creatures in a core path dungeon on the first turn
Kill a boss without ever attacking them directly
Kill a boss without any items equipped
Kill a creature with exactly the same stats as you
Spend more than 200 Souls rerolling a chest and then discard it
Survive a total of 60+ damage in a single Nest or Swamp dungeon
Wear items of the same set in the Head, Body, Legs, and Feet slots