Here is the full list of all 13 Bad Hotel achievements.
2000 Rooms
5000 Enemies Destroyed
Fire 100,000 Rounds in Total
20 Level High Hotel
10 Level High Hotel
Beat Boss 5-5
Fire 500 Rounds in a Level
Beat Boss 4-5
Beat Boss 3-5
Beat Boss 2-5
Finish Level With Over $2000
Beat Boss 1-5
1st Level Complete