The Mimic's Hoard Update Title update for Ring of Pain has 15 achievements.
Hex a frog
Heal 50+ with one potion
Complete a run with 4 or fewer items equipped
Kill 10+ creatures in one turn
Have 20 Poison on yourself
Kill Sam and spare the companions
Complete a run without replacing any equipped items
Complete a run without using any rerolls
Complete a run without ever equipping a Rare or Epic item
Complete a run without ever equipping an Epic or Legendary item
Kill an Ancient Ice Beast which has more than 30 Defense