Here is the full list of all 10 Into the Pit achievements.
Cheat Death three times in a single run
Collect 36 Journal pages
Rescue 45 Villagers
Complete 15 Dungeons
Collect 6 Key Runes
Complete 10 Dungeons
Collect 25 Support Runes
Enchant a Support Rune to Max Level
Complete 5 Dungeons
Collect 100 or more Motes of Wealth