Here is the full list of all 27 Kill The Plumber achievements.
Beat speedrun 3 in under 6 minutes.
Beat speedrun 2 in under 5 minutes.
Get all 432 stars.
Beat level 144.
Beat level 96.
Get 108 stars in map 3.
Beat level 132.
Kill the plumber 250 times.
Get 108 stars in map 2.
Beat level 120.
Beat speedrun 1 in under 4 minutes.
Beat level 108.
Beat level 84.
Beat level 72.
Beat level 48.
Get 108 stars in map 1.
Kill the plumber 100 times.
Beat level 60.
Beat level 36.
Beat level 24.
Kill the plumber on level 23 before the timer runs out.
Beat level 10 without jumping.
Kill the plumber in level 4.
Get stomped on level 1
Beat level 12.
Beat level 11 in under 6 seconds
Kill the plumber 9 times.