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