Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Activate the turnip.
Activate the monolith.
Why would you shoot ted?! He's your best and only friend!
Completed the final level.
Use a frag grenade to end your tea party.
Activate the snake.
Activate the sunglasses.
Completed the fourth level.
Use the dynamite.
Completed the third level.
Witness the potato box flying through space-time.
Completed the second level.
Activate the aviators.
Witness the zeppelin.
Witness the Red Baron.
Completed the first level.
Activate the top hat.
You really aught to do something about that stabbing habit.
Yes, well ... I'd call you a buffoon too if you poured hot water on me. Indeed!
Activate the fish!
Flip the bird, if the bird were a fancy bird.
Activate the calm book.
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.