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!
Completed the third level.
Witness the potato box flying through space-time.
Activate the monolith.
Completed the second level.
Witness the zeppelin.
Activate the snake.
Activate the aviators.
Witness the Red Baron.
Completed the first level.
Yes, well ... I'd call you a buffoon too if you poured hot water on me. Indeed!
Make a tea within a tea, or something.
Activate the turnip.
Activate the top hat.
Activate the fish!
Activate the sunglasses.
Activate the calm book.
Flip the bird, if the bird were a fancy bird.
You really aught to do something about that stabbing habit.
This hand ain't goin' nowhere.
Let the chi flow through the spasticity of your hand.