Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Make a tea within a tea, or something.
Activate the calm book.
Activate the turnip.
Activate the monolith.
Witness the potato box flying through space-time.
Completed the second level.
Activate the aviators.
Witness the zeppelin.
Witness the Red Baron.
You really aught to do something about that stabbing habit.
Completed the first level.
Activate the sunglasses.
Activate the top hat.
Activate the fish!
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.
Completed the third level.
Completed the fourth level.
Completed the final level.
Use the dynamite.
Use a frag grenade to end your tea party.
Activate the snake.
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.
Why would you shoot ted?! He's your best and only friend!
Let the chi flow through the spasticity of your hand.
This hand ain't goin' nowhere.