Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Activate the monolith.
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.
Completed the second level.
Yes, well ... I'd call you a buffoon too if you poured hot water on me. Indeed!
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.
Completed the final level.
Activate the fish!
Activate the turnip.
Activate the calm book.
Activate the aviators.
Activate the snake.
Make a tea within a tea, or something.
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.
Let the chi flow through the spasticity of your hand.
This hand ain't goin' nowhere.