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!
Flip the bird, if the bird were a fancy bird.
Completed the third level.
Witness the potato box flying through space-time.
Let the chi flow through the spasticity of your hand.
This hand ain't goin' nowhere.
Completed the second level.
Activate the aviators.
Activate the snake.
Witness the zeppelin.
Witness the Red Baron.
Completed the first level.
Activate the turnip.
Activate the top hat.
Activate the fish!
Activate the sunglasses.
Activate the calm book.
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!
Completed the final level.
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.