Here is the full list of all 13 Bugged Dungeon achievements.
Enter the Bugged Dungeon
Escaped the First Set of Spike Traps
Use a Key for the First Time to Unlock Your Way out
Experienced Losing Keys For the First Time
Halfway Thru The Dungeon
Use Portals For the First Time
Chase Down Your First Ghost Key
Entered The Red
Beat the Game
Die for the first time
Clear a level after dying 3 times
Die 6 times in the same level
Escape the a Dungeon Room with 1 second left of the clock