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