Here is the full list of all 11 Dungeons & Keyboards achievements.
Defeat Garbaj Rat, Lord of Garbage
Defeat Skullcula
Defeat Catctus
Defeat Keyboard Bot X3000
Encounter a Mimic
Climb 50 floors without a typo or timing out
Type 50 words without a typo or timing out
Type 100 words without a typo or timing out
Deal 50 critical hits back to back in one tower climb
Purchase an item at the Cool Cat's Corner
Upgrade S-Word or Fireplace at Ershin's Smithery