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