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