Here is the full list of all 23 Hypergalactic Psychic Table Tennis 3000 achievements.
Smack 100 balls
Find your first romance.
Romance 20 Paddles in one game.
Put someone's underwear on your head.
Hit Snow Monster with a fireball.
Hit Cthulhu with a Physical attack
Deal 65536 total ball damage
Hit a ball with fireballs 3 times in one rally.
Find 100 treasures.
Perform a hypergalactic loop with 0 loved paddles.
Hit the ball 1000 times overall.
Read the mind of 200 different paddles.
Romance Every Paddle in one game.
Lose 50 rallys in a row.
Romance Your Mother's Subconscious.
Beat Kevin.
Hit Balding Menace with a Physical attack.
Use Hypergalactica while fighting Nate Schmold.
Hit Kefka with a fireball.
Put on Tie-Dyed Hemp Headband.
Put on Tori Amos CD Cases boots.
Put on Biking Spandex.
Beat Ghost Cartridge with the music on.