Here is the full list of all 7 The Dungeon Paradox achievements.
Explore the level and reach the staircase down to the next level
Find and kill 100 Mummies
Find and kill 100 Veteran Mummies
Find and kill 100 Frost Mummies
Find and kill 100 Red Mushrooms
Find and kill 100 Poison Mushrooms
Find and kill 100 Ice Mushrooms