Here is the full list of all 28 Tea Party Simulator 2015 achievements.
Make a tea within a tea, or something.
This hand ain't goin' nowhere.
Let the chi flow through the spasticity of your hand.
Activate the turnip.
Activate the calm book.
Activate the aviators.
Activate the snake.
Witness the zeppelin.
Witness the Red Baron.
Completed the first level.
Activate the sunglasses.
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!
Completed the second level.
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 monolith.
Witness the potato box flying through space-time.
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.
Flip the bird, if the bird were a fancy bird.
Why would you shoot ted?! He's your best and only friend!