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