Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Get an 'S' rank in every level, in both Mode 1 and Mode 2.
Get an 'A' rank in all Mode 1 levels.
Completed the final level.
Get an 'A' rank in all Mode 2 levels.
Completed the fourth level.
Use a frag grenade to end your tea party.
Use the dynamite.
Why would you shoot ted?! He's your best and only friend!
Activate the monolith.
Completed the third level.
Witness the potato box flying through space-time.
Completed the second level.
Activate the turnip.
Activate the calm book.
Activate the fish!
Make a tea within a tea, or something.
Activate the snake.
Activate the aviators.
Witness the zeppelin.
Witness the Red Baron.
Completed the first level.
This hand ain't goin' nowhere.
Let the chi flow through the spasticity of your hand.
Yes, well ... I'd call you a buffoon too if you poured hot water on me. Indeed!
Activate the sunglasses.
Activate the top hat.
You really aught to do something about that stabbing habit.
Flip the bird, if the bird were a fancy bird.