Here is the full list of all 12 Dumpy & Bumpy achievements.
Complete World 1
Complete World 2
Complete World 3
Complete World 4
Complete World 5
Complete World 6
Complete World 7
Complete World 8
Beat All Level Par Times
Defeat the Ghostlord in 1:30 or Less!
Survive a Level for 6 Minutes
Unlocked All Trophies