Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Get an 'A' rank in all Mode 2 levels.
Completed the final level.
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.
Activate the snake.
Activate the aviators.
Witness the zeppelin.
Witness the Red Baron.
Completed the first level.
Activate the fish!
Activate the sunglasses.
Activate the calm book.
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 top hat.
Activate the turnip.
Make a tea within a tea, or something.
This hand ain't goin' nowhere.
You really aught to do something about that stabbing habit.
Flip the bird, if the bird were a fancy bird.
Get an 'S' rank in every level, in both Mode 1 and Mode 2.
Get an 'A' rank in all Mode 1 levels.