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