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