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