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
Draw 10 times
Pop 10 extra viewers bubbles
Do Jumping Jacks 10 times
Do squats 10 times
End 10 streamings
Upgrade Dance to max level
Upgrade ASMR to max level
Reach streamer rank 1
Buy 6 zones
Upgrade Jumping Jacks to max level
Upgrade Draw to max level
Upgrade Squats to max level
Buy 10 bikinis
Buy 5 bikinis
Buy 3 zones
Do Jumping Jacks 1 time
Dance 1 time
Do ASMR 1 time
Buy 1 zone
Get 1000 subs
Get 500 subs
Reach 5000 viewers
Buy 1 bikini
Draw 1 time
Do squats 1 time
End 1 streaming
Get 100 subs
Reach 1000 viewers
Pop 1 extra viewers bubble
Get 20 subs
Reach 500 viewers
Reach 100 viewers