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.
Get an 'A' rank in all Mode 2 levels.
Make a tea within a tea, or something.
Activate the calm book.
This hand ain't goin' nowhere.
Activate the turnip.
Let the chi flow through the spasticity of your hand.
Activate the aviators.
Activate the snake.
Completed the final level.
Completed the fourth level.
Use a frag grenade to end your tea party.
Why would you shoot ted?! He's your best and only friend!
Use the dynamite.
Completed the third level.
Activate the monolith.
Witness the potato box flying through space-time.
Completed the second level.
Activate the fish!
You really aught to do something about that stabbing habit.
Witness the zeppelin.
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!
Activate the sunglasses.
Activate the top hat.
Flip the bird, if the bird were a fancy bird.