Here is the full list of all 12 Athenian Rhapsody: Thunder Goober's Personality Dungeon achievements.
You've started your first token! That's amazing.
You've defeated The Fly in battle!
You've befriended the Fly in battle!
You've defeated Meesha in battle!
You've befriended Meesha in battle!
You've defeated Flipper in battle!
You've befriended Flipper in battle!
You've defeated The Bedtime Boy in battle!
You've befriended The Bedtime Boy in battle!
You've endured a fateful encounter!
You've defeated an immensely powerful wizard!
You've befriended an unfathomably powerful fast food order!