Here is the full list of all 21 AFTERGRINDER achievements.
Die a total of 1000 times
Check the credits
Complete the first world
Get every star in the first world
Die a total of 500 times
Finish 10 levels with the Shark and get the 3 stars
Die total of 200 times
Need More Challenge?
Die a total of 50 times
Someone's been dying too much
Get 3 stars in any level
Thought there was a story?
Complete the second world
Complete the third world
Complete every level in the game
Get every star in the second world
Get every star in the third world
Get every star in the game
Die a total of 2000 times
Die a total of 5000 times
Get all the achievements