Here is the full list of all 36 Hot Tub Simulator achievements.
End 50 streamings
Do ASMR 10 times
Pop 100 extra viewers bubbles
Dance 10 times
Reach 5000 viewers
Buy 6 zones
Reach streamer rank 1
Buy 3 zones
Buy 10 bikinis
Buy 5 bikinis
Upgrade ASMR to max level
Upgrade Dance to max level
End 10 streamings
Draw 10 times
Upgrade Jumping Jacks to max level
Get 1000 subs
Upgrade Squats to max level
Upgrade Draw to max level
Do Jumping Jacks 10 times
Do squats 10 times
Get 500 subs
Do ASMR 1 time
Dance 1 time
Buy 1 zone
Reach 1000 viewers
Pop 10 extra viewers bubbles
Get 100 subs
Do Jumping Jacks 1 time
Draw 1 time
Reach 500 viewers
Get 20 subs
End 1 streaming
Do squats 1 time
Reach 100 viewers
Buy 1 bikini
Pop 1 extra viewers bubble